| 摘要 |
An apparatus for driving and pulling objects such as poles, planks, boardings, and pipes, in which hammer means reciprocated by actuating means are slidably arranged in a holding body, said holding body being provided with a bottom surface and an axially spaced higher shoulder means while said hammer means has a head portion reciprocable between said bottom surface and said shoulder means, spring means selectively being insertable between said actuating means and said bottom surface for selectively converting the apparatus from a driving device to a pulling device.
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