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- https://gtt-technologies.de/faq/in-ho-jung/ (24 Aug 2019)
- http://gtt-technologies.de/data (05 Mar 2019)
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+49-(0)2407-59533
https://gtt-technologies.de/company/contact-us (11 Nov 2018)
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+49-(0)2407-59661
https://gtt-technologies.de/company/contact-us (11 Nov 2018)