US PATENT SUBCLASS 285 / 398
.~ With external

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

397  DF  INTERNAL SLEEVE {1}
398.~ With external

DEFINITION

Classification: 285/398

(under subclass 397) Subject matter also including an external tubular section overlapping the ends of the members joined.