- What does a herringbone gear look like?
- WHO'S WHO...
- American Machinist manufacturing history project.
- Arrow shows the herringbone gears.
- Massive harringbone gears added to the governor collection.
- Some of Woodward's largest oil pump gears manufactured for hydraulic governor control systems.
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- WOODWARD HERRINGBONE TYPE GEARS
- WHO'S WHO...
- MADE IN THE U.S.A.
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- American Machinist from 1923.
- A vintage machine shop manufacturing history project.
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- A machine shop manufacturing advertisement from 1923.