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Related to snatch block: sheave block
snatch block[′snach ‚bläk]
A pulley frame or sheave with an eye through which lashing can be passed to fasten it to a scaffold or pole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A pulley block that can be opened on the side to receive the bight of a rope.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.