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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a device for securing workpieces to a bench or template during fitting, joining, gluing, or assembly. C-clamps have a tightening screw passing through one end of a C-shaped frame made of metal or hard wood.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
A steel clamp, shaped like the letter C; used to hold, under pressure, two materials placed between the top of the open end of the C and a flattened end of a screw shaft which is threaded through the other end of the C.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.