US PATENT SUBCLASS 138 / 104
.~ With indicating means

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

103  DF  COMBINED {6}
104.~ With indicating means

DEFINITION

Classification: 138/104

(under subclass 103) Device including indicating means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

36, for a wear indicator.