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Hello there. I work in a biological lab in Saint Petersburg, Russia. Our lab is pretty old, so we have found these old glass slides and we were wondering exactly how old can they be. It says "Ernst Leitz, Berlin. Mikroscope & Laboratoriumsbedarf. N.W. 6 Luisen-Str. 45". I think if somebody knows until which year the Ernst Leitz GmbH was located at this adress, we could determine the minimal age of this relic.

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This is from a major Leitz distributer in Berlin and pre war. Attached is a photo of their 500+ page catalog from the 1930's, the proprieter was Franz Bergmann. The notation GMBH was not used until the early 1950's.

 

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