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- GISHOLT MACHINE COMPANY.
- Sir Charles Parsons and the steam turbine.
- BARNS DRILL COMPANY.
- Barns Drills, circa 1922.
- Brad's steam engine history project.
- Brad's vintage machine shop manufacturing project.
- CATERPILLAR TRACTORS, CIRCA 1922.
- Emerson Brantingham Company, circa 1919.
- Stock Certificate from 1923.
- Sundstrand Manufacturing Company history.
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