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| Patents for Edgar C. Guthard Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,310,473 | Jul. 22, 1919 | G.R. Fullenwider | Angular Socket Wrench | |
 | RE15,093 | Apr. 26, 1921 | G.R. Fullenwider | Angular Socket Wrench | |
 | CA-218,048 | Apr. 25, 1922 | E.C. Guthard | TOOL HANDLE | |
 | 1,455,147 | May 15, 1923 | W.J. O'Neill | Wrench and the Like | |
 | 1,457,570 | Jun. 05, 1923 | E.C. Guthard | Tool Handle and the Like | |