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noun, Machinery.
a block having four pulleys or sheaves.
Compare (def 11).


Read Also:

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    noun 1. a tackle that is composed of a rope passed through two fourfold blocks in such a way as to provide mechanical power in the ratio of 1 to 5 or 1 to 4, depending on whether hauling is done on the running or the standing block and without considering friction. Compare (def 2).

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