US PATENT SUBCLASS 33 / 21.3
.~.~ Pipe junction

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

18.1  DF  SCRIBER {10}
21.1  DF  .~ Curved surface {4}
21.3.~.~ Pipe junction

DEFINITION

Classification: 33/21.3

Pipe junction:

(under subclass 21.1) Subject matter wherein the surface is a first tube marked to show the intersection outline of a second tube on the surface of the first tube.