US PATENT SUBCLASS 148 / 909
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Current as of: June, 1999
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148 /   HD   METAL TREATMENT

902  DF  HAVING PORTIONS OF DIFFERING METALLURGICAL PROPERTIES OR CHARACTERISTICS {8}
909.~ Tube

DEFINITION

Classification: 148/909

Tube:

(under subclass 902) Art collection wherein the stock material is tubular.

(1) Note. This subclass is not limited to tubular conduits, e.g., steam pipe, but also includes hollow tubular articles, e.g., internal combustion engine wrist pins, etc.