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perforation gauge

noun, Philately.
1.
a marked ruler used to measure the number of perforations per unit length along the borders of a stamp.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for perforation-gauge

perforation gauge

noun
1.
a graduated scale for measuring perforations and roulettes of postage stamps
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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16
18
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