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Vignetting Attachment for Multiple-Exposure Cameras.

Description: Patent for a multiple exposure camera attachment that allows multiple exposures to be made on a single plate or film, blending the exposures perfectly while avoiding harsh lines. The attachment is a telescopic tubular attachment with "a plurality of apertured light ray interrupting diaphragms" (lines 77-78).
Date: April 5, 1921
Creator: Moine, Selest E.
Partner: UNT Libraries Government Documents Department

Removable Pass-Book.

Description: Patent for a book with a removable cover that lies flat when open and fits within a pocket. Particularly suited for bank books, also known as passbooks.
Date: May 3, 1921
Creator: Exline, Marcus P.
Partner: UNT Libraries Government Documents Department
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