File:"Prüfstab" von 1931.jpg

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Description"Prüfstab" von 1931.jpg	Deutsch: "Prüfstab zur Bestimmung der Polarität von stromführenden Leitungen bei Wechselstrom" von Otto Walter Kaschewsky 1931. Am 22. September 1931 wurde von Otto Walter Kaschewsky (* 14. Dezember 1902 – † 19. Juni 1971) erstmals ein "Prüfstab zur Bestimmung der Polarität von stromführenden Leitungen bei Wechselstrom" als Gebrauchsmuster beim Reichspatentamt angemeldet und am 30. Oktober 1931 eingetragen. Seit dem wurde dieser ursprüngliche "Prüfstab" zum bekannten „einpoligen Spannungsprüfer“, „Phasenprüfer“ oder „Lügenstift“ mit einer Schraubendreher-Klinge weiterentwickelt.
Date	9 December 2018
Source	Own work
Author	Weigel70

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:14, 20 November 2018		4,032 × 3,024 (1.73 MB)	Weigel70 (talk \| contribs)	Cross-wiki upload from de.wikipedia.org

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GPS date	20 November 2018