This is the celluloid plate from the front of a pantograph card punch. The instrument was patented by Herman Hollerith and used in the U. S. Census of population in 1890. A mark on it reads: THE HOLLERITH ELECTRIC TABULATING SYSTEM (/) System Patented January 8th 1889.
Compare MA.312896.
Reference:
Leon E. Truesdell, The Development of Punch Card Tabulation in the Bureau of the Census 1890–1940, Washington: U.S. Department of Commerce, 1965, pp. 43–44.
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