US PATENT SUBCLASS 29 / 525.04
.~.~.~.~ At least one part is nonmetallic

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
428  DF  .~ Assembling or joining {21}
525.01  DF  .~.~ By applying separate fastener {5}
525.02  DF  .~.~.~ Multipart cooperating fastener (e.g., bolt and nut) {2}
525.04.~.~.~.~ At least one part is nonmetallic

DEFINITION

Classification: 29/525.04

At least one part is nonmetallic:

(under subclass 525.02) Process wherein at least one of the fastener elements has no metal constituents.