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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 181 | ACOUSTICS |
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| .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) |