(under subclass 168) Apparatus in which the internal structure of the means engaged by the hand of the operator is further provided with a means to permit or stop flow or adjust the rate of flow of fluid to the fluid operated tool drive motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
18, for a tool drive controlled by relative movement of a manipulating handle.
161, for an advance causing or controlling motor control in a tool drive manipulating handle.