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| Patents for Honolulu Iron Works | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,021,829 | Apr. 02, 1912 | A.F. Ewart, W.J. Dyer | Sugar Cane Mill | sugar cane apparatus | |
| 1,061,535 | May 13, 1913 | A.F. Ewart | Sugar Cane Mill | sugar cane apparatus | |
| 1,106,291 | Aug. 04, 1914 | A.F. Ewart | Sugar Cane Mill | sugar cane apparatus | |
| 1,106,301 | Aug. 04, 1914 | C.J. Hedemann | Sugar Cane Mill | sugar cane apparatus | |