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| Patents for Harry Scheffer | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-190,226,218 | Sep. 24, 1903 | H. Scheffer | New and Useful Adjustable Screw-Key | self-adjust wrenches | |
| 741,841 | Oct. 20, 1903 | H. Scheffer | Wrench | self-adjust wrenches | |
| DE-149,630 | Mar. 17, 1904 | H. Scheffer | Verstellbarer Schraubenschlüssel ... | self-adjust wrenches | |