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| Patents for Ralph H. Schuman | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,706,544 | Apr. 19, 1955 | R.H. Schuman | Machine Tool Drive | ||
| 3,831,402 | Aug. 27, 1974 | R.H. Schuman | Knitting Machine Encoder | ||