(1):
(n.) A rough sled or dray used for dragging logs, hauling stone, etc.
(2):
(n.) A weight which is dropped into a bore, as of an oil well, to explode a cartridge previously lowered.
(3):
(n.) A device, as a loosely fitted plug, which is driven through a pipe by the pressure of the contents behind the plug to clear away obstructions.
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