Image of the United States Patent Office in Washington, D.C., at the top of a letters patent certificate transferring letters patent for "improvement in plates or dishes" from George P. Helfrish to lithographer Louis Prang; seal with witness signatures below.
Type
image
Extent
1 engraving : uncolored ; overall 38.1 x 25.08 cm (15 x 9 7/8 in.)
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