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| 1990 | The political change in the German Democratic Republic also spells a change in the relations between the Zeiss enterprises in the East and West. The enterprises declare their intention to fuse under the umbrella of a Carl Zeiss Foundation that would be legally domiciled in both Jena and Heidenheim |
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| 1991 | In the following years Carl Zeiss founds two factories in Hungary, participates in a joint venture in Belarus, and opens new agencies in eastern Europe |
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| 1995 | Carl Zeiss, Oberkochen, acquires the shares held by Jenoptik GmbH in Carl Zeiss Jena GmbH and is now the sole owner |
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| 1996 |
| The enterprise Carl Zeiss celebrates its 150th anniversary |  |
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