1940 aircraft propeller manufacturing.
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Previously:
https://www.homemadetools.net/forum/...070#post180097
https://www.homemadetools.net/forum/...136#post145451
https://www.homemadetools.net/forum/...168#post145644
https://www.homemadetools.net/forum/...079#post141127
https://www.homemadetools.net/forum/...743#post124090
