US PATENT SUBCLASS 173 / 158
.~.~.~ With relatively movable advance motor control element

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

141  DF  ADVANCE CAUSING OR CONTROLLING MEANS {6}
152  DF  .~ Motor causes or controls advance {8}
157  DF  .~.~ Common control element for advance and drive motors {1}
158.~.~.~ With relatively movable advance motor control element

DEFINITION

Classification: 173/158

(under subclass 157) Apparatus in which an additional, separately movable means to start and stop or regulate the flow of motivating energy to the motor for causing or controlling forward movement of the tool is provided to control said motor independently of the drive motor.