US PATENT SUBCLASS 381 / 64
.~.~ Mechanical (e.g., reverberation chamber)

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.~.~ Mechanical (e.g., reverberation chamber) {1}
65  DF  .~.~.~> Helical spring

DEFINITION

Classification: 381/64

Mechanical (e.g., reverberation chamber):

(under subclass 63) Subject matter where the echoes are produced by other than electrical means.