US PATENT SUBCLASS 173 / 21
.~ Distance of advance

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

20  DF  WITH INDICATING OR SIGNALING MEANS {1}
21.~ Distance of advance

DEFINITION

Classification: 173/21

(under subclass 20) Apparatus in which the means signals or indicates a position or condition of the forward movement of the tool into or along the work.