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| Patents for Henry W. Ringman | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,778,342 | Jan. 22, 1957 | H.W. Ringman | Poppet type valve distributing system for a servo-motor | ||
| 2,838,248 | Jun. 10, 1958 | H.W. Ringman | Rechipper | wood grinding machines | |