MIL-B-11837C MILITARY SPECIFICATION: BLOCKS, TACKLE (WIRE ROPE, SNATCH, EXTRA-HEAVY DUTY) (06 OCT 1983) [S/S BY A-A-59390]

MIL-B-11837C, MILITARY SPECIFICATION: BLOCKS, TACKLE (WIRE ROPE, SNATCH, EXTRA-HEAVY DUTY) (06 OCT 1983) [S/S BY A-A-59390]., This specification covers single- and double-sheaved, manual and self-locking snatch blocks