US PATENT SUBCLASS 285 / 392
.~ Attached thread bushing

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

390  DF  SCREW {3}
392.~ Attached thread bushing

DEFINITION

Classification: 285/392

(under subclass 390) Subject matter comprising an intermediate member on each pipe end, generally internally and externally screw threaded, with which the coupling means, e.g., sleeve, coacts.