US PATENT SUBCLASS 181 / 21
.~ Mouthpieces

Current as of: June, 1999
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181 /   HD   ACOUSTICS

*  DD  SPEAKING TUBES {5}
21.~ Mouthpieces

DEFINITION

Classification: 181/21

Structure of the mouthpieces of speaking-tubes and the combination therewith of accessory parts, as alarms, indicators, etc.