US PATENT SUBCLASS 181 / 149
.~ Moisture proof

Current as of: June, 1999
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181 /   HD   ACOUSTICS

148  DF  DIAPHRAGM AND ENCLOSURE {8}
149.~ Moisture proof

DEFINITION

Classification: 181/149

(under subclass 148) Subject matter wherein the means to enclose the diaphragm is waterproof or rain resistant.