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