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| Patents for Herman Erdman | |||||
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| Number | Date | Patentee | Title | Type | |
| 296,951 | Apr. 15, 1884 | G.A. Gray, Jr. | Metal Planing Machine | metal planers | |
| 597,355 | Jan. 11, 1898 | G.A. Gray, E. Richter | Feed for metal-planers | metal planers | |
| 597,356 | Jan. 11, 1898 | G.A. Gray, E. Richter | Feed for metal-planers | metal planers | |