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4 sheets, 4 p. : ill. ; 23 cm.View a full description of this patent.
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V. L. HELM.
ADVERTISING MAHINE.
APPLICATION FILED NOV 15, 1909,
989,969. Patented. Apr. 18,1911.
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Helm, Virgil L. Advertising-Machine, patent, April 18, 1911; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth512595/m1/1/: accessed May 11, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.