| 摘要 |
A wireline tool 10 is capable of permitting either a downwards hammer action for release when its top sub 12 is connected to its housing 30, or an upwards hammer action for release when its top sub is connected to its core 26, and is capable of attachment to sub-surface tools 62 of different reach dimensions by placing its shear pin 42 into a selected one of a series of longitudinally spaced apertures 40 through its core.
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