US Patent: 465,512
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| Rheostat
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Patentees:
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| Aldred K. Warren (exact or similar names) - New York, NY |
| William S. Andrews (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 25, 1891 |
| Granted: |
Dec. 22, 1891 |
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Jeff Joslin
Vintage Machinery entry for General Electric Co.
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Description: |
| This invention is a "means for controlling the speed of electric motors used to drive ventilating-fans". |
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