390117279788 This item on eBay is a photograph of a propeller workshop. Can anyone identify the makes of props? I assume it is American and the dress of the workmen suggests the 1930's?
As a short cut, here's the photo. I'm guessing that it's more likely the 20's than the thirties, but agree that it's U.S., based on the flag.
The variety of styles of props suggests to me that it might be a repair shop rather than a manufacturer. Very few props seem exactly the same, and it's a nice illustration of how many different styles existed at that time.
Perhaps it's a workshop at McCook Field, Ohio where the US Air Service tested many different aircraft designs and modifications during that time period?
Yes, it appears they did. Photos of people who worked at McCook Field show both military and civilian. In addition, they had a propeller lab, too. See: http://www.ascho.wpafb.af.mil/REMARKABLE/CHAP2.HTM
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