US PATENT SUBCLASS 181 / 147
.~ Three diaphragms

Current as of: June, 1999
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181 /   HD   ACOUSTICS

144  DF  PLURAL DIAPHRAGM SOUND SOURCES {3}
147.~ Three diaphragms

DEFINITION

Classification: 181/147

(under subclass 144) Subject matter including at least three vibrated means per unit.