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| Patents for R. H. Krenkel | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 933,878 | Sep. 14, 1909 | H.J. Borsch | Pocket Screw Driver | |
 | 1,000,659 | Aug. 15, 1911 | W.D. Adams | Marking and Spacing Device | |
| 1,062,140 | May 20, 1913 | F. Bisch | Ratchet Wrench | ||
 | 1,093,775 | Apr. 21, 1914 | A.K. Frantz | Adjustable Level Attachment | |