- Introduction to Digital Governors 019
- Introduction to Digital Governors 020
- Introduction to Digital Governors 021
- Introduction to Digital Governors 022
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- Introduction to Digital Governors
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- JAMES LEFFEL P O 50137 1917 001
- JAMES LEFFEL WATER WHEEL TURBINE WITH A A W WOODWARD SIZE 3 GOVERNOR CIRCA 1893 001
- JAMES LEFFEL
- JAMES SAW MILL 2