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Detectors 025 :
Metal Detector: (3. 3) Name: During World War II, Kosacki's name was classified in order to protect his family, which had remained behind in German-held Poland. Therefore most of his patents were submitted under pseudonyms, including "JÓzef Kos," "Kozacki" and "Kozak". As a result, his surname is often given erroneously in postwar historiography
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