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A flat metal plate for gauging the accuracy of a plane surface in precision metalworking. Also called surface plate.
(Metallurgy) a flat metal plate used for directly testing the flatness of metal surfaces in accurate metalwork
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a device for measuring the flatness of a machined surface. Also called surface plate.See also: Instruments
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