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- A Davey Compressor patent history project. 4.
- A Davey Compressor Company patent history project. 3.
- COMPRESSOR TECH 2 MAGAZINE HISTORY.
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- A Davey Compressor Company history.
- 9
- A governor patent history book.
- A vintage trade journal on the compressed air industry.
- 31
- A governor patent history project.
- Engine side of the governor.
- TRADE STANDARDS OF COMPRESSED AIR PRODUCTION.
- Governor side of the engine.
- 8
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