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In addition, use was made of journal articles, manufacturer's catalogs, and books that are contemporary with the instruments as well as more modern reference books and catalogs of established museum collections.

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However Rodenstock serial numbers, the other major European manufacturer, have been posted by Kerry Thalman.The Zeiss Gruppe is located in Heidenheim and Jena.Also controlled by the Carl-Zeiss-Stiftung are the glass manufacturers Schott AG and Jenaer Glas, located in Mainz and Jena respectively.In dating the instruments presented on this website, use was made of all available information.This information consists of dates on the microscopes or documents that accompany the microscopes, lists of serial numbers dates of manufacture, or copies of original delivery books (where available).There are currently two parts of the company, Carl Zeiss AG located in Oberkochen with important subsidiaries in Aalen, Göttingen and Munich, and Carl Zeiss Gmb H located in Jena.

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