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| Patents for Speed Changing Pulley Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 681,144 | Aug. 20, 1901 | F.W. Spacke | Speed Varying Pulley | traction engine governors | |
| 681,145 | Aug. 20, 1901 | F.W. Spacke | Self Contained Speed Varying Pulley | traction engine governors | |
| 797,001 | Aug. 15, 1905 | F.H. Heitger | Speed-Changing Gear | industrial machine speed and direction changing mechanisms | |