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| Patents for National Machine Tool Co. (Cincinnati) | |||||
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| Number | Date | Patentee | Title | Type | |
| 667,406 | Feb. 05, 1901 | W.L. Schellenbach | Variable Speed Gearing | industrial machine gearing | |
| 683,003 | Sep. 17, 1901 | W.L. Schellenbach | Variable-speed mechanism | industrial machine pulleys and belt drive mechanisms | |
| CA-74,997 | Mar. 04, 1902 | W.L. Schellenbach | Variable speed mechanism | metal lathes | |
| 725,779 | Apr. 21, 1903 | W.L. Schellenbach | Screw mechanism | ||
| 795,420 | Jul. 25, 1905 | W.L. Schellenbach | Key-seating tool | key seating machines | |