US PATENT SUBCLASS 181 / 168
.~.~ Metallic material

Current as of: June, 1999
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181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
167  DF  .~ Critically defined material or coating {3}
168.~.~ Metallic material

DEFINITION

Classification: 181/168

(under subclass 167) Subject matter wherein the material of which the diaphragm is made is metal.