US PATENT SUBCLASS 173 / 10
.~.~ Responsive to length of stroke of means reciprocating hammer head or tool

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

2  DF  AUTOMATIC CONTROL OF POWER OPERATED MEANS {4}
4  DF  .~ Tool advance causing or controlling means {2}
10.~.~ Responsive to length of stroke of means reciprocating hammer head or tool

DEFINITION

Classification: 173/10

(under subclass 4) Apparatus in which the sensing means senses the distance of cyclic to and fro motion of a (1) hammer head or (2) tool.