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Related to Keyhole saw: compass saw
keyhole saw[′kē‚hōl ‚sȯ]
A fine compass saw with a blade 11-16 inches (28-41 centimeters) long.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A small handsaw with a thin tapering blade designed for cutting small rounded openings, such as a keyhole. They are also used to enlarge holes and notch structural members for cables and conduit.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A compass saw having an especially narrow blade and fine teeth.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.