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A-A-59170 NOT 3
Block and Tackle with Load-Locking Device
This commercial item description (CID) covers a double-sheaved, single-reeved, nylon rope block and tackle with a locking device commonly used to lift and move objects. The block and tackle is intended for used in rigging, construction, and other military operations to gain a mechanical advantage when hoisting, pulling, or moving heavy objects and to hold loads in place through use of a safety locking device.
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Department of Defense [dod]