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- The Mechanical News, an illustrated journal of. v23 no 9. Circa 1893.
- 1893 advertisement for the James Leffel & Company.
- The Mechanical News magazine history.
- Knowledge is power!
- THE MECHANICAL NEWS ADVERTISEMENTS FOR 1893.
- A hydroelectric power plant equipment history project.
- THE MECHANICAL NEWS
- PAGE 1. PUBLISHED AND PRINTED IN 1888 BY THE JAMES LEFFEL & COMPANY.
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- THE MECHANICAL NEWS FROM MARCH 1886.
- THE MECHANICAL NEWS FROM APRIL 1886. ADVERTISEMENTS PAGE 3.
- CHAMPION WATER WHEEL GOVERNOR AD FROM 1886.