Vignetting Attachment for Multiple-Exposure Cameras.
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Vignetting Attachment for Multiple-Exposure Cameras., patent, April 5, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259597/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.