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| Patents for Gerald Den Herder | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,187,471 | Jun. 08, 1965 | G. Den Herder | Belt grinding apparatus | belt sanders | |
| 3,267,619 | Aug. 23, 1966 | G. Den Herder | Belt grinding machine | belt sanders | |