| http://www.w3.org/ns/prov#value | - In a power tool having a throttle valve to control power to the tool, driving means, selectively operable in either a forward or reverse direction, spindle means adapted for holding a tool, control means, including a valve and an escapement plunger, for turning on and off the driving means, clutch means, including a ball spline, interconnecting the driving means and spindle means, whereby the ball
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