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| All Patents in class 400/621 | |||||
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| Number | Date | Patentee | Title | Type | |
| 687,167 | Nov. 19, 1901 | A.H. Roovers, A.W. Roovers | Die press | ||
| 781,620 | Jan. 31, 1905 | A.H. Roovers, A.W. Roovers | Die press | patternmaker | |