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| Patents for H. O. Van Antwerp | |||||
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| Number | Date | Patentee | Title | Type | |
| 939,284 | Nov. 09, 1909 | W.Y. Mentzer | Quick-Acting Woodworking-Vise | woodworkers vises | |
| 954,376 | Apr. 05, 1910 | W.R. Buss | Sectional chip-breaker for planing-machines | wood planers | |
| 982,979 | Jan. 31, 1911 | H.E. Morton | Work Holder for Shaping Machine | metal shaper accessories | |