Translations:Dictionary:Arm/1/en
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{{#category_index:A|arm}} 1. A bow spring or lever connected to a logging sonde that presses against the borehole wall (a) to centralize the tool, (b) to push the tool to the opposite side of the borehole, or (c) to hold a sensor pad to the borehole wall. 2. To prepare a blaster or a perforating gun for firing.