Floor cramp

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an implement for tightening the seams of floor boards before nailing them in position.

See also: Floor

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Clamp the first six rows together by using a floor clamp, which should be attached to a joist with the grip against the nearest board.
Floor clamp or jack used before subflooring was developed.