"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 4249857 | Steam turbine governor A governor for a steam operated engine by which the steam valve opening for any selected engine speed can be varied to accommodate different steam pressures, or conversely with a constant steam pressure, the steam valve opening may be varied to produce an... | 02/10/1981 |
| 4201520 | Steam turbine governor A governor for a steam operated engine by which the steam valve opening for any selected engine speed can be varied to accommodate different steam pressures, or conversely with a constant steam pressure, the steam value opening may be varied to produce an... | 05/06/1980 |