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Patents for F. G. Hackenberg | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 713,179 | Nov. 11, 1902 | J.A. Traut | Points for a Marking Gage | |
![]() | 927,903 | Jul. 13, 1909 | A. Veitch | Gage and Marking Device |