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| Patents for Jacob de Koning | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,664,024 | Mar. 27, 1928 | J. de Koning | Grinding machine | |
 | 1,841,939 | Jan. 19, 1932 | J. de Koning, C.H. Antrim | Band saw structure | |
 | 1,854,610 | Apr. 19, 1932 | J. de Koning | Work-feeding mechanism | |