US PATENT SUBCLASS 340 / 397.4
.~.~.~ Having spring

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

384.1  DF  AUDIBLE INDICATION {11}
392.1  DF  .~ Percussion-type sound producer (e.g., signal chimes or bells) {15}
397.3  DF  .~.~ Interrupter {1}
397.4.~.~.~ Having spring

DEFINITION

Classification: 340/397.4

Having spring:

(under subclass 397.3) Subject matter wherein means for controlling the flow of current includes a resilient contact member or is supported by a resilient member.