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- Rodney Hunt Co Ca 1922
- Rodney Hunt Turbine
- Rodney Hunt products
- Ross Powerhouse with Pelton cabinet Governors 2
- Ross Powerhouse with Pelton cabinet Governors
- Ross Powerhouse with Pelton cabinet Governors3
- Ross Powerhouse with Pelton cabinet Governors 5
- Ross Powerhouse with Pelton controls ca 1989 4
- Ross Powerhouse with Pelton controls ca 1989 6
- Ross Powerhouse with Pelton controls ca 1989 2
- Rudolf Diesel Patent from 1893
- Ryan Hydro Facility on the Missouri River 1
- Ryan Hydro Facility on the Missouri River MT 3
- Ryan Hydro Facility on the Missouri River MT 2
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