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The Velox book : the working of a simple paper told in simple terms (1915)
[Tacoma, Wash. : French Drug Co.] · leaf 33
No. 1 Shaded portions represent opaque paper. White portion shows part cut out. No. 2 Shaded portions represent opaque paper. White portion shows part cut out. 31Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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