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| Patents for L. E. Harper | |||||
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| Number | Date | Patentee | Title | Type | |
| 610,677 | Sep. 13, 1898 | C.L. Grohmann | Tail-stock for milling-machines | milling machines | |
| 734,837 | Jul. 28, 1903 | J. Edgar | Change-feed mechanism | metalworking speed changing mechanisms | |