US PATENT SUBCLASS 340 / 397.2
.~.~.~ 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}
397.1  DF  .~.~ Armature support {1}
397.2.~.~.~ Having spring

DEFINITION

Classification: 340/397.2

Having spring:

(under subclass 397.1) Subject matter comprising a resilient member for carrying the armature, for restoring the armature

to a normal position or for supplementing the effect of the current to move the armature.