Wytwórnia Sprzętu Komunikacyjnego (Transport Equipment Company) was a name given to many Polish factories producing transport, engines, aviation and military eqipment.

First known place of propeller production was WSK 6, which was simply new “coded” LWD factory. Next known WSK 4 was  Warsaw (Okęcie?), where production was moved from LWD Łòdź. During 19- 50-ties and 60-ties wooden propellers were also produced in Jeżów and – likely Krosno or Świdnik.

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