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| Patents for Harold L. Heywood | |||||
| Number | Date | Patentee | Title | Type | |
| 2,392,963 | Jan. 15, 1946 | H.L. Heywood, J.B. Armitage | Milling Machine | milling machines | |
| 2,816,487 | Dec. 17, 1957 | J.L. Martin, H.L. Heywood, J.B. Armitage | Milling Machine | milling machines | |