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| Patents for Lewis E. Harper | |||||
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| Number | Date | Patentee | Title | Type | |
| 608,854 | Aug. 09, 1898 | L.E. Harper, C.L. Grohmann | Ball-bearing | industrial machine bearings | |
| 612,239 | Oct. 11, 1898 | L.E. Harper, C.L. Grohmann | Machine for dressing metals or other materials | bicycle machinery | |
| 612,240 | Oct. 11, 1898 | L.E. Harper, C.L. Grohmann | Machine for dressing and grinding metal | grinders | |
| 612,332 | Oct. 11, 1898 | C.L. Grohmann | Attachment for metal-working machines | milling machine accessories | |