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