US PATENT SUBCLASS 173 / 15
.~ Drive motor controlled

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

13  DF  DRIVE CONTROLLED BY RELATIVE AXIAL MOVEMENT OF TOOL {2}
15.~ Drive motor controlled {1}
16  DF  .~.~> Modified internal motor operation {1}

DEFINITION

Classification: 173/15

(under subclass 13) Apparatus in which the tool is driven by a motor and the relative movement initiates, modifies or terminates the operation of the tool drive motor.