| Subclass |
| Title |
|---|
|
ClassTitle
|
| ===>
WELLS
|
| | | |
| 335 | ![[Patents]](../gifs/ps.gif) | SUBMERGED WELL |
| 336 | | . Testing |
| 337 | | . . For leak |
| 338 | | . Connection or disconnection of submerged members remotely controlled |
| 339 | | . . With provision for removal or repositioning of member without removal of other well structure |
| 340 | | . . Disconnection |
| 341 | | . . With orienting or aligning of member for connection |
| 342 | | . . . Including removable, member mounted guide |
| 343 | | . . . Including means to pull member into position |
| 344 | | . . Connection to provide fluid flow path |
| 345 | | . . . Connection of riser-and-tubing assembly to other structure |
| 346 | | . . . Yieldable tubing |
| 347 | | . . . Connection of lateral flow line |
| 348 | | . . Connection of pipe hanging |
| 349 | | . . Connection of guide means |
| 350 | | . Submerged, buoyant wellhead or riser |
| 351 | | . Means removably connected to permanent well structure |
| 352 | | . . Surface vessel |
| 353 | | . . . Having means to move vessel to precise location |
| 354 | | . . . Having means to hold vessel at given location (e.g., anchor, etc.) |
| 355 | | . . . With means to compensate for vessel movement |
| 356 | | . . Means to provide protective environment for operative access below surface of water |
| 357 | | . . Separator |
| 358 | | . . Drilling means |
| 359 | | . . Removable riser |
| 360 | | . . Well component assembly means |
| 361 | | . . Pipe cutting means |
| 363 | | . With safety or emergency shutoff |
| 364 | | . Including disaster feature |
| 365 | | . With provision for disassembly |
| 366 | | . Multiple wells |
| 367 | | . Riser |
| 368 | | . Wellhead |
| 244.1 | | PROCESSES |
| 245 | | . Specific pattern of plural wells |
| 246 | | . Using microorganisms |
| 247 | | . Nuclear energy or radioactivity for treating |
| 248 | | . Electric current or electrical wave energy through earth for treating |
| 249 | | . Vibrating the earth or material in or being placed in the earth pores |
| 250.01 | | . With indicating, testing, measuring or locating |
| 251.1 | | . . Including in situ combustion |
| 252.1 | | . . Including production of earth fluid by driving fluid |
| 252.2 | | . . . Residual oil or oil saturation |
| 252.3 | | . . . Salinity or acidity |
| 252.4 | | . . . Flood front |
| 252.5 | | . . . Permeability or viscosity |
| 252.6 | | . . . And tracing material |
| 253.1 | | . . Indicating the location, presence, or absence of cement |
| 254.1 | | . . Determining position of earth zone or marker |
| 254.2 | | . . . Well logging |
| 255.1 | | . . Determining position of object in well |
| 255.2 | | . . . Tool orienting |
| 255.3 | | . . . . Using whipstock |
| 250.02 | | . . Permeability determining |
| 250.03 | | . . Determining fluid interface or fluid level |
| 250.04 | | . . Plug indicating or releasing |
| 250.05 | | . . Scale or corrosion determination |
| 250.06 | | . . Steam quality |
| 250.07 | | . . Bottom hole pressure |
| 250.08 | | . . Leak testing or locating |
| 250.09 | | . . Impression means |
| 250.1 | | . . Fracturing characteristic |
| 250.11 | | . . Holder for coupon or sensor |
| 250.12 | | . . Tracer |
| 250.13 | | . . Determining stuck point |
| 250.14 | | . . Of cementing or plugging technique |
| 250.15 | | . . Automatic control for production |
| 250.16 | | . . Prospecting |
| 250.17 | | . . Including testing or treating tool having at least one actuatable packer |
| 256 | | . In situ combustion |
| 257 | | . . Injecting while producing by in situ combustion from same well |
| 258 | | . . Plural distinct superimposed formations |
| 259 | | . . Including fracturing or attacking formation |
| 260 | | . . Injecting specific fuel or catalyst for burning into formation |
| 261 | | . . Injecting specific material other than oxygen into formation |
| 262 | | . . Solid fuel or particles in well |
| 264 | | . Sampling well fluid |
| 265 | | . Separating material entering well |
| 266 | | . . Injection and producing wells |
| 267 | | . . Separating outside of well |
| 268 | | . Distinct, separate injection and producing wells |
| 270 | | . . Injecting a composition to adjust the permeability (e.g., selective plugging) |
| 270.1 | | . . Injecting a composition including a surfactant or cosurfactant |
| 270.2 | | . . . Nonaqueous type |
| 400 | | . . Sequentially injected separate fluids (e.g., slugs) |
| 401 | | . . . Injecting a gas or gas mixture |
| 402 | | . . . . CO2 or carbonated gas |
| 403 | | . . . . . In combination with additional organic material (e.g., alkyls, carbon chains) |
| 272.1 | | . . Involving the step of heating |
| 272.2 | | . . . In association with fracturing or crevice forming processes |
| 272.3 | | . . . Steam as drive fluid |
| 272.4 | | . . . . In combination with alkyls or carbon chains |
| 272.5 | | . . . . With override zone, diverting, or path blocking operation |
| 272.6 | | . . . Liquid material injected |
| 272.7 | | . . . Horizontal well |
| 271 | | . . Including fracturing or attacking formation |
| 269 | | . . Fluid injected from longitudinally spaced locations in injection well |
| 275 | | . . Injected fluid comprises water and material other than inorganic gas |
| 263 | | . Cyclic injection then production of a single well |
| 276 | | . Providing porous mass of adhered filter material in well |
| 277 | | . Repairing object in well |
| 278 | | . Graveling or filter forming |
| 279 | | . Material placed in pores of formation to treat resident fluid flowing into well |
| 280 | | . Specific propping feature for a fracture |
| 281 | | . Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking formation |
| 282 | | . Specific low fluid loss feature for fluid attacking formation |
| 283 | | . Specific low fluid loss feature for fracturing fluid or cement causes fracture |
| 284 | | . Fluid flow causes pellet to block opening in wall of conduit |
| 285 | | . Cementing, plugging or consolidating |
| 286 | | . . Tamping, vibrating, exploding or using receptacle |
| 287 | | . . Removable molding or forming means |
| 288 | | . . Including heating |
| 289 | | . . Discharging cement from casing at different levels |
| 290 | | . . By tubing which is subsequently lifted |
| 291 | | . . With piston separator |
| 292 | | . . Using specific materials |
| 293 | | . . . Cement or consolidating material contains inorganic water settable and organic ingredients |
| 294 | | . . . Cement or consolidating material is organic or has organic ingredient |
| 295 | | . . . . Organic material is resin or resinous |
| 296 | | . Preventing flow into strainer while lowering by blocking openings |
| 297 | | . Perforating, weakening, bending or separating pipe at an unprepared point |
| 298 | | . . Perforating, weakening or separating by mechanical means or abrasive fluid |
| 299 | | . With explosion or breaking container to implode |
| 300 | | . Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant) |
| 301 | | . Freeing stuck object, grappling or fishing in well |
| 302 | | . Heating, cooling or insulating |
| 303 | | . . Placing preheated fluid into formation |
| 304 | | . Dissolving or preventing formation of solid oil deposit |
| 305.1 | | . Placing fluid into the formation |
| 306 | | . . Fluid enters and leaves well at spaced zones |
| 307 | | . . Attacking formation |
| 308 | | . . Fracturing |
| 309 | | . Producing foam or gas in well by foaming or gas producing material |
| 310 | | . Entraining or incorporating treating material in flowing earth fluid |
| 311 | | . Cleaning or unloading well |
| 312 | | . . Liquid introduced from well top |
| 313 | | . Parallel string or multiple completion well |
| 369 | | . Producing the well |
| 370 | | . . Including varying downhole pressure |
| 371 | | . . Including non-expulsive material placed in well |
| 372 | | . . By fluid lift |
| 373 | | . Operating valve, closure, or changeable restrictor in a well |
| 374 | | . . Operated by fluid pressure controlled above ground |
| 375 | | . . . By auxilliary fluid control line |
| 376 | | . Destroying or dissolving well part |
| 377 | | . Disassembling well part |
| 378 | | . Assembling well part |
| 379 | | . . Above ground parts |
| 380 | | . . Conduit |
| 381 | | . Placing or shifting well part |
| 382 | | . . Providing support for well part (e.g., hanger or anchor) |
| 383 | | . . By fluid driven piston |
| 384 | | . . With bending of tubing |
| 385 | | . . Flexible cable or wire |
| 386 | | . . Fluid flow control member (e.g., plug or valve) |
| 387 | | . . With sealing feature (e.g., packer) |
| 50 | | WELLS WITH LATERAL CONDUITS |
| 51 | | MEANS FOR FORMING FILTER BEDS (E.G., GRAVEL PLACING) |
| 52 | | PLURAL WELLS |
| 53 | | AUTOMATIC |
| 54 | | . Float controlled valve |
| 54.1 | | WITH MEANS FOR SEPARATELY PUMPING FROM PLURAL SOURCES IN WELL |
| 54.5 | | MEANS FOR CUTTING CABLE OR ROPE BELOW GROUND |
| 54.6 | | . Cutting means actuated by contacting element suspended in well by cable or rope |
| 55 | | MEANS FOR PERFORATING, WEAKENING, BENDING OR SEPARATING PIPE AT AN UNPREPARED POINT |
| 55.1 | | . With disparate below ground feature |
| 55.2 | | . Perforating or splitting cutter |
| 55.3 | | . . Wedge or cam actuated |
| 55.6 | | . Cutter rotates circumferentially of pipe |
| 55.7 | | . . Internal |
| 55.8 | | . . . Tool moved radially by fluid pressure |
| 56 | | SCREEN AND OUTSIDE CLEANING PIPE |
| 57 | | WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS |
| 58 | | . Fuel supply or hot billet in well |
| 59 | | . Burner in well |
| 60 | | . Electrical heater in well |
| 61 | | . Heater surrounding production tube |
| 62 | | . With eduction pump or plunger in well |
| 63 | | WITH EXPLOSIVE OR GAS GENERATING MEANS IN WELL |
| 64 | | WITH TIME OR DISTANCE MEASURING, TEMPERATURE RESPONSIVE OR COUNTING MEANS |
| 65.1 | | WITH ELECTRICAL MEANS |
| 66 | | . Indicating |
| 66.4 | | . Electrical motor (e.g., solenoid actuator) |
| 66.5 | | . Magnetic |
| 66.6 | | . Valve |
| 66.7 | | . . Longitudinally movable operator |
| 67 | | WITH BELOW AND ABOVE GROUND MODIFICATION |
| 68 | | . Eduction pump or plunger in well |
| 68.5 | | . . With above ground (1) motor carried by casing or casing support or (2) well fluid pump |
| 69 | | . With receptacle for insertion into well |
| 70 | | . Head for tool, piston or cleaner (e.g., cement head) |
| 71 | | . With above ground casing sinking means |
| 72 | | . Above ground actuating means for below ground device |
| 73 | | . . Tubing or casing actuated |
| 74 | | . With below ground screen |
| 75.11 | | ABOVE GROUND APPARATUS |
| 76.1 | | . Having structure for converting from one mode of operation to another; e.g., valve to packer |
| 77.1 | | . Moving tubing or cable into an existing well |
| 77.2 | | . . Coiled tubing |
| 77.3 | | . . . Chain injector |
| 77.4 | | . . Piston and cylinder |
| 77.51 | | . With means facilitating connecting or disconnecting supported tubing or rod sections |
| 77.52 | | . . With elevator detail |
| 77.53 | | . . Upper and lower slips |
| 85.1 | | . With assembly or disassembly means (e.g., handling, guiding, or tool feature) |
| 85.2 | | . . Pitless well adapters |
| 85.3 | | . . Seal or bushing insertion or removal |
| 85.4 | | . . With blowout preventer |
| 85.5 | | . . Guiding or aligning feature |
| 86.1 | | . Inner member anchor or seal with valve |
| 86.2 | | . . Annular sealing type valve |
| 86.3 | | . . Gate type (perpendicular to pipe) valve |
| 87.1 | | . . Axially movable type valve |
| 88.1 | | . Inner member anchor or seal with lateral port |
| 89.1 | | . . Plural inner pipes |
| 89.2 | | . . . Parallel pipes (as opposed to concentric) |
| 89.3 | | . . . Having slip type hanger |
| 88.2 | | . . Slip type well anchor |
| 88.3 | | . . . Seal actuated with anchor |
| 88.4 | | . . With hydraulic conduit or line extending through outer member |
| 78.1 | | . With tube rotating means (rotary tables) |
| 79.1 | | . Cap having transporting means or ground support |
| 80.1 | | . Having retractable pipe section to allow closing of gate type valve or flapper valve for rod or pipe |
| 81.1 | | . Fluid catcher around pipe coupling |
| 82.1 | | . Releasable seal or cleaner disengaged by projection on inner member |
| 83.1 | | . . Latches releasable radially inward |
| 84.1 | | . With seal for reciprocating member |
| 84.2 | | . . Cooling fluid or grease supplied to seals |
| 84.3 | | . . Rotary blowout preventer type |
| 84.4 | | . . Fluid pressure actuated seals |
| 84.5 | | . . Seal fixedly mounted to rod |
| 90.1 | | . With means for inserting fluid into well |
| 75.15 | | . With means for injecting solid or particulate material into the well |
| 91.1 | | . With flow restrictions (e.g., chokes or beans) |
| 92.1 | | . Cap or head pivotably attached to tube or casing |
| 93.1 | | . Split cap or head |
| 94.1 | | . Laterally adjustable cap or head |
| 95.1 | | . Central valve or closure and lateral port |
| 96.1 | | . External anchoring or bracing means |
| 97.1 | | . With valve on cap or head |
| 75.13 | | . Well caps or casing heads |
| 75.14 | | . Suspension means |
| 75.12 | | . Treatment of produced fluids |
| 97.5 | | . Parallel pipes extending along distinct paths through wellhead |
| 98 | | GRAPPLE AND WELL ANCHORED LIFTING MEANS |
| 99 | | WITH JUNK RETRIEVING MEANS |
| 100 | | LATERAL PROBE OR PORT SEALED AGAINST WELL WALL |
| 101 | | PACKER OR PLUG AND PUMP OR PLUNGER MEANS EXERTING OUTWARD PRESSURE |
| 102 | | CONVERTIBLE |
| 104 | | WITH MOTOR FOR ROTARY OR OSCILLATING MOTION |
| 105 | | WITH EDUCTION PUMP OR PLUNGER |
| 105.1 | | . Having sediment trap or deflector |
| 105.2 | | . . Carried by reciprocating plunger or plunger rod |
| 105.3 | | . . Sediment trap formed in pumping chamber |
| 105.4 | | . . In pump discharge flow path |
| 105.5 | | . Having liquid-gas separator |
| 105.6 | | . . Gas fed to entrainment type pump |
| 106 | | . With packer or plug |
| 107 | | . Receptacles |
| 108 | | . . Piston actuates foot valve |
| 109 | | . . Telescoping |
| 110 | | . . Lateral port always below piston and used in well |
| 111 | | . . Bail engaging piston rod |
| 112 | | . With leak means |
| 113 | | COMBINED (E.G., WITH NON-ELECTRICAL INDICATING) |
| 114 | | CENTRAL MEMBER WITH PRE-SET PACKER OR PLUG IN SAME CONDUIT |
| 115 | | CENTRAL CHAMBER SEALED WITH RESPECT TO PREPOSITIONED MODIFIED SURROUNDING CONDUIT |
| 116 | | . Surrounding conduit carries packer or plug |
| 117 | | RECEPTACLE OR PART THEREOF LEFT IN WELL |
| 117.5 | | MEANS FOR GUIDING INSERTABLE ELEMENT LATERALLY OF WELL AXIS (E.G., WHIPSTOCK) |
| 117.6 | | . Secured in operative position by movable means engaging well conduit (e.g., anchor) |
| 117.7 | | MEANS ANCHORED AGAINST ROTATION IN ONE CONDUIT SECTION FOR RELATIVELY ROTATING ANOTHER SECTION |
| 179 | | PACKERS OR PLUGS |
| 118 | | . With expanding anchor |
| 119 | | . . Relatively movable packers or plugs |
| 120 | | . . Anchor actuated by fluid pressure |
| 121 | | . . . Pressure transmitted by cup type packer or plug seal |
| 122 | | . . . Pressure transmitted by packer or plug expanded by confined fluid from central chamber, pump, or plunger |
| 123 | | . . With detachable setting means |
| 124 | | . . . Screw threaded |
| 125 | | . . . Radially movable latch |
| 126 | | . . With controllable passage between central chamber and space below packer |
| 127 | | . . . Spaced packer or plug seals |
| 128 | | . . . Passage controllable by movement of central chamber |
| 129 | | . . With controllable bypass outside central conduit |
| 130 | | . . . Packer expanded by upper valve |
| 131 | | . . With controllable passage between central conduit and space above packer or plug |
| 132 | | . . Portion extends beyond end of surrounding conduit |
| 133 | | . . With controllable passage through packer |
| 134 | | . . Support and holddown expanding anchors |
| 135 | | . . Flow stopping type, e.g., plug |
| 136 | | . . Spring set anchor |
| 137 | | . . . Spring moves anchor slip relative to wedge or cam |
| 138 | | . . Wedge or cam and friction drag |
| 139 | | . . . Threaded element rotated |
| 140 | | . . . Anchor above packer or plug seal |
| 141 | | . Sealing portion closes port between central pipe and outside space when unexpanded |
| 142 | | . With controllable passage between central chamber and space below packer |
| 143 | | . . Central conduit detachable |
| 144 | | . . . Bottom supported casing or screen section |
| 145 | | . . Bypass closing and passage opening to upward flow constrained to occur simultaneously |
| 146 | | . . Passage connects with space below packers and continuously open passageway connects with space between packers |
| 147 | | . . Passage connects with space between packer or plug seals |
| 148 | | . . Upwardly biased check valve and means for opening or bypassing it |
| 149 | | . . With passageway between central chamber and space above packer |
| 150 | | . . . Passageway controllable by movement of central chamber |
| 151 | | . . . Passageway valve directly responsive to fluid pressure |
| 152 | | . . Passage controllable by movement of central chamber |
| 180 | | . Adjustable over pipe or set over prepositioned pipe |
| 181 | | . With detachable setting means |
| 182 | | . . Packer or plug locked expanded |
| 183 | | . With controllable bypass outside central conduit |
| 184 | | . With controllable passage between central conduit and space above packer or plug |
| 185 | | . With central conduit and fluid port to space outside |
| 186 | | . . Port between sealing portions and bypass around |
| 187 | | . Expanded by confined fluid from central chamber, pump or plunger |
| 188 | | . Controllable passage through packer |
| 189 | | . For non-concentric members |
| 191 | | . Spaced sealing portions |
| 192 | | . Flow stopping type; e.g., plug |
| 193 | | . . Free falling type (e.g., dropped ball) |
| 194 | | . . . With sleeve valve |
| 195 | | . Deformable portion engages conduit restriction |
| 196 | | . Central support has shoulders expanding sealing portion, or telescopes |
| 202 | | . Cup type |
| 203 | | . Non-deformable type |
| 153 | | PISTONS, FLUID DRIVEN INTO WELL (E.G., CEMENTING PLUGS) |
| 154 | | . Surrounding conduit valve or closure opened by piston |
| 155 | | . With downflow past piston |
| 156 | | . With stop |
| 157 | | SCREEN WITH WASHING POINT OR SHOE |
| 158 | | . Detachable wash pipe |
| 162 | | RECEPTACLES |
| 163 | | . With separate air chamber having openable passage |
| 164 | | . With destroyable closure and valve |
| 165 | | . With valved or closed top |
| 166 | | . Valve control means contacting well conduit wall |
| 167 | | . Bottom receiving and side discharge valves |
| 168 | | . Readily releasable bottom valve |
| 169 | | . Lateral ports used in well |
| 170 | | BRUSHING, SCRAPING, CUTTING OR PUNCHING-TYPE CLEANERS |
| 171 | | . Perforation cleaners |
| 172 | | . Bow spring type |
| 173 | | . On tubing or casing |
| 174 | | . Retractable on support while lowering |
| 175 | | . Reciprocable relative to central member extending from well top |
| 176 | | . On sucker rod |
| 177.1 | | SONIC DEVICE |
| 177.2 | | . With specific downhole feature |
| 177.3 | | WIPER |
| 177.4 | | CEMENTING DEVICE |
| 177.5 | | HYDRAULIC FRACTURING DEVICE |
| 177.6 | | VIBRATOR |
| 177.7 | | AGITATOR |
| 178 | | WITH JAR MEANS FOR RELEASING STUCK PART |
| 205 | | SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL |
| 206 | | EXPANSIBLE ANCHOR OR CASING |
| 207 | | . Expansible casing |
| 208 | | . Liner hanger |
| 209 | | . Set by wedge or cam at any point by drop only (e.g., tubing catcher) |
| 210 | | . . With friction drag for setting by turning movement also |
| 211 | | . . With spring |
| 212 | | . Fluid pressure actuated |
| 213 | | . Bowed anchor means |
| 214 | | . Spring set |
| 215 | | . . Spring moves anchor slip relative to wedge or cam |
| 216 | | . With wedge or cam and friction drag |
| 217 | | . Expansible means translated by wedge or cam |
| 222 | | WHIRLING OR LATERAL DISCHARGE OR PROJECTABLE NOZZLES |
| 223 | | . Rotary or projectable |
| 316 | | VALVES, CLOSURES OR CHANGEABLE RESTRICTORS |
| 317 | | . Destructible element |
| 318 | | . Operated by dropped element |
| 319 | | . Fluid operated |
| 320 | | . . Variably opened |
| 321 | | . . Fluid pressure biased to open position position |
| 322 | | . . . Retrievable |
| 323 | | . . . Locked open or closed |
| 324 | | . . . With fluid pressure equalizing means |
| 325 | | . . One way, e.g., check valve type |
| 326 | | . . . Flexible valve element |
| 327 | | . . . Shoes with check valve |
| 328 | | . . . . Loose ball closure |
| 329 | | . . Loose ball closure with limited reverse flow |
| 330 | | . Rotated operator |
| 331 | | . . Lug in branched slot, e.g., "J" slot |
| 332.1 | | . Longitudinally movable operator |
| 332.2 | | . . Having rotational movement |
| 332.3 | | . . . Ball valve type |
| 332.4 | | . . Operated by means inserted from the surface |
| 332.5 | | . . Valving means inserted or retrieved to operate |
| 332.6 | | . . Having a dump or discharge type means |
| 332.7 | | . . Having equalizing valve |
| 332.8 | | . . Flapper type |
| 333.1 | | . . Contact with bore bottom |
| 334.1 | | . . Vertical movement of conduit |
| 334.2 | | . . . And rotational movement; e.g., ball valve-type |
| 334.3 | | . . . Drain-type |
| 334.4 | | . . . Fluid flow through lateral port to exterior |
| 227 | | SCREENS |
| 228 | | . Porous material |
| 229 | | . Inserted screen plug |
| 230 | | . Woven mesh |
| 231 | | . Spiral |
| 232 | | . . With spacing lug for adjacent turns |
| 233 | | . . With perforated pipe |
| 234 | | . Strip or rod |
| 235 | | . Stacked annular sections |
| 236 | | . Concentric pipes |
| 237 | | DETENTS OR CLUTCHES |
| 238 | | . Flow permitting means bridging fluid conduit |
| 239 | | . Operated by dropped weight |
| 240 | | . Lug in closed branched slot |
| 241.1 | | GUIDE FOR DEVICE OR CONDUIT |
| 241.2 | | . On sucker or pump rod |
| 241.3 | | . . Rotatable or having a rotatable element |
| 241.4 | | . . Surrounding existing rod |
| 241.5 | | . For a wireline operation |
| 241.6 | | . Surrounding existing device or tubing |
| 241.7 | | . . Removably secured by a fastener (e.g., pin) parallel to tubing |
| 242.1 | | CONDUIT WALL OR SPECIFIC CONDUIT END STRUCTURE |
| 242.2 | | . Flexible tube or cable |
| 242.3 | | . Plural, parallel, nonconcentric conduits |
| 242.4 | | . Corrosion prevention or deterring |
| 242.5 | | . Side entry |
| 242.6 | | . Downhole coupling or connector |
| 242.7 | | . . Telescopic |
| 242.8 | | . Shoe detail |
| 242.9 | | . Brick or cement casing liner |
| 243 | | MISCELLANEOUS (E.G., ANCHOR PIPES) |
| | | ****************************** |
| | | CROSS-REFERENCE ART COLLECTIONS |
| | | ****************************** |
| 901 | | WELLS IN FROZEN TERRAIN |
| 902 | | FOR INHIBITING CORROSION OR COATING |
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