| 摘要 |
A power driven wrench which comprises a handle housing containing a power source and a motor disposed therein, a motor gear coaxially connected to the motor, a head housing united with said handle housing as a unit, said head housing containing a hexagonal, cutout socket receiving head gear adapted to receive a socket for engaging various types of nuts and bolts. A plurality of gears connecting the motor gear and the head gear, and a plurality of top ball bearing sets and bottom ball bearing sets, which are spring biased to engage top surface and a bottom surface of the head gear.
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