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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
| You are viewing a USPC Schedule. |
| Class 181 | ACOUSTICS |
| Click here for a printable version of this file | |
![]() | ![]() | .5 | MISCELLANEOUS |
| SPEAKING TUBES |
![]() | ![]() | 30 | AUDITORIUM |
![]() | ![]() | 101 | GEOPHYSICAL OR SUBSURFACE EXPLORATION |
![]() | ![]() | 102 | Well logging |
![]() | ![]() | 103 | Programmed or timer-controlled |
![]() | ![]() | 104 | Directional source or detector |
![]() | ![]() | 105 | Bore hole or casing condition |
![]() | ![]() | 106 | Seismic wave generation |
![]() | ![]() | 107 | Programmed or timer-controlled |
![]() | ![]() | 108 | Seismic source and detector |
![]() | ![]() | 113 | Seismic wave generation |
![]() | ![]() | 114 | Vehicle-mounted |
![]() | ![]() | 115 | Bubble suppression or control |
![]() | ![]() | 116 | Explosive |
![]() | ![]() | 119 | Fluid means |
![]() | ![]() | 121 | Moving weight |
![]() | ![]() | 122 | Seismic wave detection |
![]() | ![]() | 123 | ECHO SYSTEM |
![]() | ![]() | 125 | SOUND LOCATION |
![]() | ![]() | 126 | ANATOMIC OR PROSTHETIC RELATION |
![]() | ![]() | 138 | MECHANICAL TELEPHONE |
![]() | ![]() | 139 | WAVE GENERATION AND DETECTION |
![]() | ![]() | 140 | WITH VESSEL |
![]() | ![]() | 141 | COMBINED |
![]() | ![]() | 142 | WAVE GENERATION |
![]() | ![]() | 143 | MOVING SOUND PRODUCER OR DEFLECTOR |
![]() | ![]() | 144 | PLURAL DIAPHRAGM SOUND SOURCES |
![]() | ![]() | 148 | DIAPHRAGM AND ENCLOSURE |
![]() | ![]() | 149 | Moisture proof |
![]() | ![]() | 150 | Recessed (e.g., wall-mounted, etc.) |
![]() | ![]() | 151 | With sound-absorbing means |
![]() | ![]() | 152 | With horn |
![]() | ![]() | 153 | Rounded enclosure (e.g., curved, etc.) |
![]() | ![]() | 154 | Inclined diaphragm |
![]() | ![]() | 155 | Reflector baffle |
![]() | ![]() | 156 | Reflex baffle |
![]() | ![]() | 157 | DIAPHRAGM |
![]() | ![]() | 158 | Microphone type |
![]() | ![]() | 159 | With horn |
![]() | ![]() | 160 | With resonant chamber |
![]() | ![]() | 161 | With direct mechanical connection to drive unit |
![]() | ![]() | 163 | Plural dependent diaphragms |
![]() | ![]() | 164 | Sectional diaphragm |
![]() | ![]() | 166 | With damping means |
![]() | ![]() | 167 | Critically defined material or coating |
![]() | ![]() | 171 | Mounting or suspension means |
![]() | ![]() | 173 | Particular shape |
![]() | ![]() | 175 | SOUND-MODIFYING MEANS |
![]() | ![]() | 176 | Lens |
![]() | ![]() | 177 | Intensifying horn |
![]() | ![]() | 178 | Collapsible |
![]() | ![]() | 179 | With particular mounting structure |
![]() | ![]() | 180 | Material |
![]() | ![]() | 181 | With vibratory filaments |
![]() | ![]() | 182 | With resonant chamber |
![]() | ![]() | 184 | Having apertures in walls |
![]() | ![]() | 185 | With sound-path restriction |
![]() | ![]() | 187 | Plural intensifying portions |
![]() | ![]() | 189 | Multisection housing |
![]() | ![]() | 191 | With external sound deflector |
![]() | ![]() | 192 | Particular shape of the horn |
![]() | ![]() | 196 | Within tubular means |
![]() | ![]() | 198 | Housing or enclosure (e.g., sound confining and absorbing) |
![]() | ![]() | 206 | By wave interference |
![]() | ![]() | 207 | Mechanical vibration attenuator |
![]() | ![]() | 210 | Sound absorbing fence or screen (e.g., jet engine or vehicle noise) |
![]() | ![]() | 211 | Combined |
![]() | ![]() | 212 | Muffler, fluid conducting type |