US PATENT SUBCLASS 181 / 169
.~.~ Fibrous material


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
167  DF  .~ Critically defined material or coating {3}
169.~.~ Fibrous material


DEFINITION

Classification: 181/169

(under subclass 167) Subject matter wherein the material of which the diaphragm is made consists of or includes fibers.