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| Patents for L. B. Marshall | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,048,380 | Dec. 24, 1912 | C.F. Youngquist, C.G. Youngquist | Wrench | |
 | 1,261,540 | Apr. 02, 1918 | H.V. Hughes | Wrench | |