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All Patents in class 400/673 | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 687,167 | Nov. 19, 1901 | A.H. Roovers, A.W. Roovers | Die press | |
![]() | 775,354 | Nov. 22, 1904 | A.H. Roovers, A.W. Roovers | Die press | |
![]() | 781,620 | Jan. 31, 1905 | A.H. Roovers, A.W. Roovers | Die press |