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| Patents for Harry J. Caldwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,671,292 | Mar. 09, 1954 | E.Y. Seborg, H.J. Caldwell | Control Mechanism for Honing Machines | machine tool controls | |
| 2,867,139 | Jan. 06, 1959 | H.J. Caldwell | Boring unit | ||