syncopated perforation
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Postage stamp separation — For postage stamps, separation is the means by which individual stamps are made easily detachable from each other. Methods of separation include: # perforation cutting rows and columns of small holes # rouletting small horizontal and vertical… … Wikipedia
percussion instrument — a musical instrument, as the drum, cymbal, triangle, xylophone, or piano, that is struck to produce a sound, as distinguished from string or wind instruments. [1870 75] * * * A musical instrument that is struck (or sometimes shaken or scraped) to … Universalium
