By: Arabella-Cox - 24th March 2022 at 18:58
For the Lockheed Electra? Not an answer to your specific questions, but these may provide leads;
https://app.aircorpslibrary.com/aircraft/hamilton-standard-propellers
https://enginehistory.org/Propellers/HamStd/hamstd.shtml
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March 24, 2022 at 3:34 pm