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- Arrow shows the herringbone gears.
- WOODWARD HERRINGBONE TYPE GEARS
- Some of Woodward's largest oil pump gears manufactured for hydraulic governor control systems.
- Massive harringbone gears added to the governor collection.
- INGERSOLL ADVERTISEMENT.
- PLEASE DO NOT FEED BREWER BRAD.
- P & W PRECISION MACHINERY.
- PRECISION TOOLS.
- Brad's vintage machine shop manufacturing history project.
- Vintage machine shop manufacturing history project.
- Brad's vintage machine shop manufacturing history project.
- The Pratt & Whitney machine shop manufacturing history.
- 13B
- 17
- American Machinist from 1923.