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| Patents for D. H. Harper | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 682,263 | Sep. 10, 1901 | C.S. Du Mont | Bit-brace | |
 | 1,105,609 | Aug. 04, 1914 | E.F. Beugler | Stave Jointing Machine | |
 | 1,127,166 | Feb. 02, 1915 | E.F. Beugler | Variable Speed Countershaft | |
 | 1,153,479 | Sep. 14, 1915 | E.F. Beugler | Combined belt- and drum-sanding machine | |