https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=13805&pn=1,808,190 Wrench Set Unit Patentee: Frank J. Vlchek - Cleveland OH Granted:1931-06-02

The patent covers a set of six double open end wrenches of graduated sizes and its hinged metal holder. The set based on this patent has sizes 3/8" through 15/16". Vlchek's wrench sets were also produced with a spring wire holder (viz. pat. no 1,875,815), and a solid panel holder with sliding latch which received patent no. 1,877,466 on Sept. 31, 1932.
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