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| Patents for John A. Roberts | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,792,208 | May 14, 1957 | J.A. Roberts, J.C. Merrill | Control Provision for Recording Mechanism | ||
| 2,864,605 | Dec. 16, 1958 | J.A. Roberts, M.T. Thorsson | Automatic Range Changer with Weight Pick-Up | ||