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Valve

Description: Patent for a "blow-off valve" (line 16). Illustrations included
Date: December 29, 1908
Creator: Koch, Rudolph
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Pin for Engravers' Blocks.

Description: Patent for a pin for engravers' blocks for holding items to be engraved on the block. It has grooves of various widths on the sides to fit different size objects.
Date: July 16, 1907
Creator: Martin, Joseph Clay
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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