| 摘要 |
A manually operated apparatus for driving a member such as a tool or fastening element into the surface of a receiving material includes a device for driving the member, a base supportable on the surface into which the member is to be driven, and a holder attached to the device and pivotally connected to the base for providing a visual indication of an angular disposition of the drive axis of the device relative to the surface of the receiving material and for positioning the drive axis perpendicular to the surface.
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