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[Search a list of Patent Appplications for class 181]  Class   181ACOUSTICS
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    [List of Patents for class 181 subclass .5]  .5           MISCELLANEOUS
                SPEAKING TUBES
    [List of Patents for class 181 subclass 18]  18           Subclass 18 indent level is 1 Systems
    [List of Patents for class 181 subclass 19]  19           Subclass 19 indent level is 1 Alarms and indicators
    [List of Patents for class 181 subclass 20]  20           Subclass 20 indent level is 1 Combined mouth and ear pieces
    [List of Patents for class 181 subclass 21]  21           Subclass 21 indent level is 1 Mouthpieces
    [List of Patents for class 181 subclass 22]  22           Subclass 22 indent level is 1 Tubes
    [List of Patents for class 181 subclass 30]  30           AUDITORIUM
   [List of Patents for class 181 subclass 101]  101           GEOPHYSICAL OR SUBSURFACE EXPLORATION
   [List of Patents for class 181 subclass 102]  102           Subclass 102 indent level is 1 Well logging
    [List of Patents for class 181 subclass 103]  103           Subclass 103 indent level is 2 Programmed or timer-controlled
    [List of Patents for class 181 subclass 104]  104           Subclass 104 indent level is 2 Directional source or detector
    [List of Patents for class 181 subclass 105]  105           Subclass 105 indent level is 2 Bore hole or casing condition
    [List of Patents for class 181 subclass 106]  106           Subclass 106 indent level is 2 Seismic wave generation
    [List of Patents for class 181 subclass 107]  107           Subclass 107 indent level is 1 Programmed or timer-controlled
   [List of Patents for class 181 subclass 108]  108           Subclass 108 indent level is 1 Seismic source and detector
    [List of Patents for class 181 subclass 109]  109           Subclass 109 indent level is 2 Aerial
    [List of Patents for class 181 subclass 110]  110           Subclass 110 indent level is 2 Underwater
    [List of Patents for class 181 subclass 111]  111           Subclass 111 indent level is 2 Plural sources
    [List of Patents for class 181 subclass 112]  112           Subclass 112 indent level is 2 Plural detectors
   [List of Patents for class 181 subclass 113]  113           Subclass 113 indent level is 1 Seismic wave generation
    [List of Patents for class 181 subclass 114]  114           Subclass 114 indent level is 2 Vehicle-mounted
    [List of Patents for class 181 subclass 115]  115           Subclass 115 indent level is 2 Bubble suppression or control
   [List of Patents for class 181 subclass 116]  116           Subclass 116 indent level is 2 Explosive
   [List of Patents for class 181 subclass 117]  117           Subclass 117 indent level is 3 Gas
    [List of Patents for class 181 subclass 118]  118           Subclass 118 indent level is 4 Underwater
   [List of Patents for class 181 subclass 119]  119           Subclass 119 indent level is 2 Fluid means
    [List of Patents for class 181 subclass 120]  120           Subclass 120 indent level is 3 Underwater
    [List of Patents for class 181 subclass 121]  121           Subclass 121 indent level is 2 Moving weight
    [List of Patents for class 181 subclass 122]  122           Subclass 122 indent level is 1 Seismic wave detection
   [List of Patents for class 181 subclass 123]  123           ECHO SYSTEM
    [List of Patents for class 181 subclass 124]  124           Subclass 124 indent level is 1 Altitude or depth detection
    [List of Patents for class 181 subclass 125]  125           SOUND LOCATION
   [List of Patents for class 181 subclass 126]  126           ANATOMIC OR PROSTHETIC RELATION
    [List of Patents for class 181 subclass 127]  127           Subclass 127 indent level is 1 Dentiphone
   [List of Patents for class 181 subclass 128]  128           Subclass 128 indent level is 1 Ear and mouth
    [List of Patents for class 181 subclass 129]  129           Subclass 129 indent level is 2 Ear
   [List of Patents for class 181 subclass 130]  130           Subclass 130 indent level is 2 Auditory canal insert
    [List of Patents for class 181 subclass 131]  131           Subclass 131 indent level is 3 Stethoscope
    [List of Patents for class 181 subclass 132]  132           Subclass 132 indent level is 3 With diaphragm
    [List of Patents for class 181 subclass 133]  133           Subclass 133 indent level is 3 Deflector type
    [List of Patents for class 181 subclass 134]  134           Subclass 134 indent level is 3 Eardrum
    [List of Patents for class 181 subclass 135]  135           Subclass 135 indent level is 3 Ear insert
    [List of Patents for class 181 subclass 136]  136           Subclass 136 indent level is 2 Deflector type
    [List of Patents for class 181 subclass 137]  137           Subclass 137 indent level is 2 Receiver
    [List of Patents for class 181 subclass 138]  138           MECHANICAL TELEPHONE
    [List of Patents for class 181 subclass 139]  139           WAVE GENERATION AND DETECTION
    [List of Patents for class 181 subclass 140]  140           WITH VESSEL
    [List of Patents for class 181 subclass 141]  141           COMBINED
    [List of Patents for class 181 subclass 142]  142           WAVE GENERATION
    [List of Patents for class 181 subclass 143]  143           MOVING SOUND PRODUCER OR DEFLECTOR
   [List of Patents for class 181 subclass 144]  144           PLURAL DIAPHRAGM SOUND SOURCES
    [List of Patents for class 181 subclass 145]  145           Subclass 145 indent level is 1 Plural chambers
    [List of Patents for class 181 subclass 146]  146           Subclass 146 indent level is 1 With sound-asborbing means
    [List of Patents for class 181 subclass 147]  147           Subclass 147 indent level is 1 Three diaphragms
   [List of Patents for class 181 subclass 148]  148           DIAPHRAGM AND ENCLOSURE
    [List of Patents for class 181 subclass 149]  149           Subclass 149 indent level is 1 Moisture proof
    [List of Patents for class 181 subclass 150]  150           Subclass 150 indent level is 1 Recessed (e.g., wall-mounted, etc.)
    [List of Patents for class 181 subclass 151]  151           Subclass 151 indent level is 1 With sound-absorbing means
    [List of Patents for class 181 subclass 152]  152           Subclass 152 indent level is 1 With horn
    [List of Patents for class 181 subclass 153]  153           Subclass 153 indent level is 1 Rounded enclosure (e.g., curved, etc.)
    [List of Patents for class 181 subclass 154]  154           Subclass 154 indent level is 1 Inclined diaphragm
    [List of Patents for class 181 subclass 155]  155           Subclass 155 indent level is 1 Reflector baffle
    [List of Patents for class 181 subclass 156]  156           Subclass 156 indent level is 1 Reflex baffle
   [List of Patents for class 181 subclass 157]  157           DIAPHRAGM
    [List of Patents for class 181 subclass 158]  158           Subclass 158 indent level is 1 Microphone type
    [List of Patents for class 181 subclass 159]  159           Subclass 159 indent level is 1 With horn
    [List of Patents for class 181 subclass 160]  160           Subclass 160 indent level is 1 With resonant chamber
   [List of Patents for class 181 subclass 161]  161           Subclass 161 indent level is 1 With direct mechanical connection to drive unit
    [List of Patents for class 181 subclass 162]  162           Subclass 162 indent level is 2 Stylus bar
    [List of Patents for class 181 subclass 163]  163           Subclass 163 indent level is 1 Plural dependent diaphragms
   [List of Patents for class 181 subclass 164]  164           Subclass 164 indent level is 1 Sectional diaphragm
    [List of Patents for class 181 subclass 165]  165           Subclass 165 indent level is 2 Concentric annular section
    [List of Patents for class 181 subclass 166]  166           Subclass 166 indent level is 1 With damping means
   [List of Patents for class 181 subclass 167]  167           Subclass 167 indent level is 1 Critically defined material or coating
    [List of Patents for class 181 subclass 168]  168           Subclass 168 indent level is 2 Metallic material
    [List of Patents for class 181 subclass 169]  169           Subclass 169 indent level is 2 Fibrous material
    [List of Patents for class 181 subclass 170]  170           Subclass 170 indent level is 2 Laminated type
   [List of Patents for class 181 subclass 171]  171           Subclass 171 indent level is 1 Mounting or suspension means
    [List of Patents for class 181 subclass 172]  172           Subclass 172 indent level is 2 Elastic suspension means
   [List of Patents for class 181 subclass 173]  173           Subclass 173 indent level is 1 Particular shape
    [List of Patents for class 181 subclass 174]  174           Subclass 174 indent level is 2 Variable thickness
   [List of Patents for class 181 subclass 175]  175           SOUND-MODIFYING MEANS
    [List of Patents for class 181 subclass 176]  176           Subclass 176 indent level is 1 Lens
   [List of Patents for class 181 subclass 177]  177           Subclass 177 indent level is 1 Intensifying horn
    [List of Patents for class 181 subclass 178]  178           Subclass 178 indent level is 2 Collapsible
    [List of Patents for class 181 subclass 179]  179           Subclass 179 indent level is 2 With particular mounting structure
    [List of Patents for class 181 subclass 180]  180           Subclass 180 indent level is 2 Material
    [List of Patents for class 181 subclass 181]  181           Subclass 181 indent level is 2 With vibratory filaments
   [List of Patents for class 181 subclass 182]  182           Subclass 182 indent level is 2 With resonant chamber
    [List of Patents for class 181 subclass 183]  183           Subclass 183 indent level is 3 Double wall
    [List of Patents for class 181 subclass 184]  184           Subclass 184 indent level is 2 Having apertures in walls
   [List of Patents for class 181 subclass 185]  185           Subclass 185 indent level is 2 With sound-path restriction
    [List of Patents for class 181 subclass 186]  186           Subclass 186 indent level is 3 Adjustable
   [List of Patents for class 181 subclass 187]  187           Subclass 187 indent level is 2 Plural intensifying portions
    [List of Patents for class 181 subclass 188]  188           Subclass 188 indent level is 3 Similar portions
   [List of Patents for class 181 subclass 189]  189           Subclass 189 indent level is 2 Multisection housing
    [List of Patents for class 181 subclass 190]  190           Subclass 190 indent level is 3 Separable
    [List of Patents for class 181 subclass 191]  191           Subclass 191 indent level is 2 With external sound deflector
   [List of Patents for class 181 subclass 192]  192           Subclass 192 indent level is 2 Particular shape of the horn
    [List of Patents for class 181 subclass 193]  193           Subclass 193 indent level is 3 Spiral sound path
    [List of Patents for class 181 subclass 194]  194           Subclass 194 indent level is 3 Doubly folded sound path
    [List of Patents for class 181 subclass 195]  195           Subclass 195 indent level is 3 Wide angle annular outlet
   [List of Patents for class 181 subclass 196]  196           Subclass 196 indent level is 1 Within tubular means
    [List of Patents for class 181 subclass 197]  197           Subclass 197 indent level is 2 Adjustable
   [List of Patents for class 181 subclass 198]  198           Subclass 198 indent level is 1 Housing or enclosure (e.g., sound confining and absorbing)
    [List of Patents for class 181 subclass 199]  199           Subclass 199 indent level is 2 Speaker type
   [List of Patents for class 181 subclass 200]  200           Subclass 200 indent level is 2 Machine type enclosure