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[Search a list of Patent Appplications for class 37]  Class   37EXCAVATING
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    [List of Patents for class 37 subclass 300]  300           GRAVE DIGGER
   [List of Patents for class 37 subclass 301]  301           LAND CLEARER
    [List of Patents for class 37 subclass 302]  302           Subclass 302 indent level is 1 Tree or stump remover
    [List of Patents for class 37 subclass 303]  303           Subclass 303 indent level is 1 Stone remover
    [List of Patents for class 37 subclass 3]  3           PEAT EXCAVATORS
   [List of Patents for class 37 subclass 196]  196           SNOW OR ICE REMOVING OR GROOMING BY PORTABLE DEVICE
    [List of Patents for class 37 subclass 197]  197           Subclass 197 indent level is 1 Process
   [List of Patents for class 37 subclass 198]  198           Subclass 198 indent level is 1 Railway clearer
   [List of Patents for class 37 subclass 199]  199           Subclass 199 indent level is 2 With melter
    [List of Patents for class 37 subclass 200]  200           Subclass 200 indent level is 3 Heated plow
    [List of Patents for class 37 subclass 201]  201           Subclass 201 indent level is 2 Explosive
    [List of Patents for class 37 subclass 202]  202           Subclass 202 indent level is 2 Fluid current conveyor
   [List of Patents for class 37 subclass 203]  203           Subclass 203 indent level is 2 For clearing single rail of set
    [List of Patents for class 37 subclass 204]  204           Subclass 204 indent level is 3 Electrified rail
   [List of Patents for class 37 subclass 205]  205           Subclass 205 indent level is 3 Including rotary excavating tool
    [List of Patents for class 37 subclass 206]  206           Subclass 206 indent level is 4 And scraper blade
    [List of Patents for class 37 subclass 207]  207           Subclass 207 indent level is 3 Including means clearing side of, or groove in, rail
    [List of Patents for class 37 subclass 208]  208           Subclass 208 indent level is 2 With endless conveyor
   [List of Patents for class 37 subclass 209]  209           Subclass 209 indent level is 2 Having rotary excavating tool
   [List of Patents for class 37 subclass 210]  210           Subclass 210 indent level is 3 Plural rotary tools
    [List of Patents for class 37 subclass 213]  213           Subclass 213 indent level is 3 Screw-type auger
   [List of Patents for class 37 subclass 214]  214           Subclass 214 indent level is 2 Having scraper blade
   [List of Patents for class 37 subclass 215]  215           Subclass 215 indent level is 3 Inclined plane with V-divider
    [List of Patents for class 37 subclass 217]  217           Subclass 217 indent level is 3 V-shaped
    [List of Patents for class 37 subclass 218]  218           Subclass 218 indent level is 3 Diagonal
   [List of Patents for class 37 subclass 219]  219           Subclass 219 indent level is 1 Snow or ice surface groomer
    [List of Patents for class 37 subclass 220]  220           Subclass 220 indent level is 2 Including rut cutter
   [List of Patents for class 37 subclass 221]  221           Subclass 221 indent level is 2 Having diverse tools
    [List of Patents for class 37 subclass 222]  222           Subclass 222 indent level is 3 Including rotary tool
   [List of Patents for class 37 subclass 223]  223           Subclass 223 indent level is 2 Having rotary tool
    [List of Patents for class 37 subclass 224]  224           Subclass 224 indent level is 3 Compacting roller
   [List of Patents for class 37 subclass 225]  225           Subclass 225 indent level is 1 With compressor die
    [List of Patents for class 37 subclass 226]  226           Subclass 226 indent level is 2 And heater
   [List of Patents for class 37 subclass 227]  227           Subclass 227 indent level is 1 With melter
   [List of Patents for class 37 subclass 228]  228           Subclass 228 indent level is 2 Having heated transport chamber
    [List of Patents for class 37 subclass 229]  229           Subclass 229 indent level is 3 Electric or solar heat source
    [List of Patents for class 37 subclass 230]  230           Subclass 230 indent level is 2 Manually powered
    [List of Patents for class 37 subclass 231]  231           Subclass 231 indent level is 1 With specific means to facilitate connection to, or disconnection from, vehicle
   [List of Patents for class 37 subclass 232]  232           Subclass 232 indent level is 1 Vehicle mount with obstacle responsive trip, or yieldable tool (e.g., brush)
    [List of Patents for class 37 subclass 233]  233           Subclass 233 indent level is 2 Resilient impeller or blade
    [List of Patents for class 37 subclass 234]  234           Subclass 234 indent level is 1 Including specific hydraulic control system to position implement
   [List of Patents for class 37 subclass 235]  235           Subclass 235 indent level is 1 Vehicle mount including power lift
    [List of Patents for class 37 subclass 236]  236           Subclass 236 indent level is 2 Power means is hydraulically actuated piston
   [List of Patents for class 37 subclass 237]  237           Subclass 237 indent level is 1 With endless conveyor
    [List of Patents for class 37 subclass 238]  238           Subclass 238 indent level is 2 And rotary excavating tool
    [List of Patents for class 37 subclass 239]  239           Subclass 239 indent level is 2 Multistage conveyors
    [List of Patents for class 37 subclass 240]  240           Subclass 240 indent level is 2 Carrying excavating tool
   [List of Patents for class 37 subclass 241]  241           Subclass 241 indent level is 1 Combined or convertible
   [List of Patents for class 37 subclass 242]  242           Subclass 242 indent level is 2 Rotary excavating tool
    [List of Patents for class 37 subclass 243]  243           Subclass 243 indent level is 3 Lawnmower
   [List of Patents for class 37 subclass 244]  244           Subclass 244 indent level is 1 Motorized rotary excavating tool
    [List of Patents for class 37 subclass 245]  245           Subclass 245 indent level is 2 Tool arresting means responsive to sensed condition
    [List of Patents for class 37 subclass 246]  246           Subclass 246 indent level is 2 Electric motor drive
    [List of Patents for class 37 subclass 247]  247           Subclass 247 indent level is 2 Rotor shaft adjustable relative to direction of travel
   [List of Patents for class 37 subclass 248]  248           Subclass 248 indent level is 2 Diverse multistage rotary tools or tool portions (e.g., feeding and throwing, etc.)
   [List of Patents for class 37 subclass 253]  253           Subclass 253 indent level is 2 Fed by scraper blade
   [List of Patents for class 37 subclass 254]  254           Subclass 254 indent level is 3 Including screw-type auger
    [List of Patents for class 37 subclass 255]  255           Subclass 255 indent level is 4 Augers on separate shafts
    [List of Patents for class 37 subclass 256]  256           Subclass 256 indent level is 3 Including centrifugal impeller
   [List of Patents for class 37 subclass 257]  257           Subclass 257 indent level is 2 Screw-type auger
    [List of Patents for class 37 subclass 258]  258           Subclass 258 indent level is 3 Having plural vane segments
    [List of Patents for class 37 subclass 259]  259           Subclass 259 indent level is 2 Centrifugal impeller
   [List of Patents for class 37 subclass 260]  260           Subclass 260 indent level is 2 Having specific flow guide
    [List of Patents for class 37 subclass 261]  261           Subclass 261 indent level is 3 Having motor powered adjustment
    [List of Patents for class 37 subclass 262]  262           Subclass 262 indent level is 3 Vane within chute controls flow path
    [List of Patents for class 37 subclass 263]  263           Subclass 263 indent level is 1 Tool prepares wheel path for passage of wheel
   [List of Patents for class 37 subclass 264]  264           Subclass 264 indent level is 1 Scoop
    [List of Patents for class 37 subclass 265]  265           Subclass 265 indent level is 2 Manually powered
   [List of Patents for class 37 subclass 266]  266           Subclass 266 indent level is 1 Scraper blade
    [List of Patents for class 37 subclass 267]  267           Subclass 267 indent level is 2 Invertible
   [List of Patents for class 37 subclass 268]  268           Subclass 268 indent level is 2 Pulled (e.g., by horse or vehicle)
    [List of Patents for class 37 subclass 269]  269           Subclass 269 indent level is 3 V-shaped
   [List of Patents for class 37 subclass 270]  270           Subclass 270 indent level is 2 Mounted on surface contacting support or guide
    [List of Patents for class 37 subclass 271]  271           Subclass 271 indent level is 3 For adjusting height of blade
   [List of Patents for class 37 subclass 272]  272           Subclass 272 indent level is 2 V-shaped
    [List of Patents for class 37 subclass 273]  273           Subclass 273 indent level is 3 Adjustable or collapsible apex
   [List of Patents for class 37 subclass 274]  274           Subclass 274 indent level is 3 And auxiliary wing or extension
    [List of Patents for class 37 subclass 275]  275           Subclass 275 indent level is 4 Top flap
    [List of Patents for class 37 subclass 276]  276           Subclass 276 indent level is 3 Diverging forwardly
    [List of Patents for class 37 subclass 277]  277           Subclass 277 indent level is 3 Supported on inclined plane
    [List of Patents for class 37 subclass 278]  278           Subclass 278 indent level is 3 Manually powered
   [List of Patents for class 37 subclass 279]  279           Subclass 279 indent level is 2 Diagonally oriented
    [List of Patents for class 37 subclass 280]  280           Subclass 280 indent level is 3 Including side gate discharge preventer
    [List of Patents for class 37 subclass 281]  281           Subclass 281 indent level is 3 And auxiliary wing or extension
    [List of Patents for class 37 subclass 282]  282           Subclass 282 indent level is 3 Supported on inclined plane
    [List of Patents for class 37 subclass 283]  283           Subclass 283 indent level is 3 Adjustable about central vertical hinge
    [List of Patents for class 37 subclass 284]  284           Subclass 284 indent level is 3 Manually powered
    [List of Patents for class 37 subclass 285]  285           Subclass 285 indent level is 1 Manually powered
   [List of Patents for class 37 subclass 304]  304           SELF-LOADING VEHICLE
    [List of Patents for class 37 subclass 305]  305           Subclass 305 indent level is 1 Having endless digger or conveyor
    [List of Patents for class 37 subclass 306]  306           Subclass 306 indent level is 1 Elevating wheel
   [List of Patents for class 37 subclass 307]  307           BENEATH A BODY OF WATER (E.G., DREDGER)
    [List of Patents for class 37 subclass 308]  308           Subclass 308 indent level is 1 With signal, scale, indicator, or inspection means
   [List of Patents for class 37 subclass 309]  309           Subclass 309 indent level is 1 With means to control dredger operation (e.g., movement of dredged material) in response to sensed condition
    [List of Patents for class 37 subclass 310]  310           Subclass 310 indent level is 2 Swell compensator
    [List of Patents for class 37 subclass 311]  311           Subclass 311 indent level is 2 Suction relief valve
    [List of Patents for class 37 subclass 312]  312           Subclass 312 indent level is 2 Control of swing or swing speed
    [List of Patents for class 37 subclass 313]  313           Subclass 313 indent level is 1 By use of submarine or undersea vessel
   [List of Patents for class 37 subclass 314]  314           Subclass 314 indent level is 1 Adapted to excavate specific discrete material
   [List of Patents for class 37 subclass 315]  315           Subclass 315 indent level is 2 Shellfish
    [List of Patents for class 37 subclass 316]  316