US PATENT SUBCLASS 381 / 65
.~.~.~ Helical spring

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

61  DF  SOUND EFFECTS {2}
63  DF  .~ Reverberators {1}
64  DF  .~.~ Mechanical (e.g., reverberation chamber) {1}
65.~.~.~ Helical spring

DEFINITION

Classification: 381/65

Helical spring:

(under subclass 64) Subject matter where the echoes are produced by reflecting a compressional sound wave along a helical spring.