US PATENT SUBCLASS 313 / 369
.~.~ Mechanically responsive (e.g., sound)

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

364  DF  CATHODE RAY TUBE {11}
365  DF  .~ Image pickup tube {6}
369.~.~ Mechanically responsive (e.g., sound)

DEFINITION

Classification: 313/369

(under subclass 365) Subject matter including structure responsive to pressure

(1) Note. Devices responsive to compressional waves are included here.