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- A vintage governor manufacturing equipment project for the hydro-electric power plant Industry.
- Brad found the Hydro Plant where Elmer had his picture taken with his new governor type.
- Brad found the Hydro Plant where Elmer installed his new Hydraulic type governor.
- CHRISTIANA MACHINE COMPANY.
- LIST OF ILLUSTRATIONS. PAGE 2.
- Serial number name plate with four patent dates.
- Speed Regulation of Water Power Plants.
- "WORLD'S LARGEST GOVERNOR BUILDER".
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