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- James Leffel's tombstone.
- James Leffel's tombstone showing his patented turbine water wheel.
- James Leffel's Samson turbines at Niagara Falls.
- James Leffel's Samson turbines at Niagara Falls.
- JAMES LEFFEL WATER WHEEL TURBINE WITH A WOODWARD SIZE 3 GOVERNOR, CIRCA 1893.
- JAMES LEFFEL WATER WHEEL TURBINE WITH A A W WOODWARD SIZE 3 GOVERNOR CIRCA 1893 001
- JAMES LEFFEL WATER WHEEL TURBINE WITH A A W WOODWARD SIZE 3 GOVERNOR CIRCA 1893
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 006
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 005
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 004
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 003
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 002
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909 001
- JAMES LEFFEL TURBINE WITH A WOODWARD LR 2500 GOVERNOR CA 1909
- JAMES LEFFEL P O 50137 1917 001