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Astra and Schwarz props

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  • Astra and Schwarz props

    Hello all,
    I am looking for info on two types of propellors;
    first the Astra company made propellors in the early twenties up to the thirties, maybe longer
    second is the Schwarz company, German, which made the Schwarz mantel props, which were covered not by cloth, but by sheet metal.
    Who knows more about these two companies?

    Kind regards,
    Edwin
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