Calculating-Yardstick Page: 2 of 7
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H. .J, WEIERHAUSER.
APPLICATION PILED MAY 12, 1910.
Patented Mar. 14,1911.
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Weierhauser, Henry J. Calculating-Yardstick, patent, March 14, 1911; [Washington D.C.]. (texashistory.unt.edu/ark:/67531/metapth514790/m1/2/: accessed December 16, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting UNT Libraries Government Documents Department.