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- A jet engine fuel control governor unit disassembled and all the components on display.
- A James Watt steam Engine.
- A James Watt steam engine in Dampfmaschine.
- A James Watt portrait.
- A James Watt double-acting steam engine.
- A James Watt double-acting steam engine.
- A JAMES LEFFEL'S DOUBLE TURBINE WATER WHEEL ADVERTISEMENT.
- A James Leffel Water Wheel Company letter from 1870.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel & Company letter, circa 1870.
- A James Leffel & Company letter to Woodward, circa 1937.