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| Patents for R. Schaefer | |||||
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| Number | Date | Patentee | Title | Type | |
| 946,140 | Jan. 11, 1910 | H.A. Knoke | Draw-clamp | bar and pipe clamps | |
| 1,053,556 | Feb. 18, 1913 | O. Bergstrom | Corner-clamping appliance | miter and corner clamps | |
| 1,067,541 | Jul. 15, 1913 | C.A. Palmgren | Stapling device | staplers | |