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| Patents for William P. Holden | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,223,132 | Apr. 17, 1917 | W.P. Holden, C.J. Zigler | Lumber Tester | |
| 1,280,354 | Oct. 01, 1918 | W.P. Holden, C.J. Zigler | Compression Recorder | ||