1 - DBP Telekom, Infobase 1991
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2. OPD frankfurt 1991
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3. DBP telekom isdn transfer 1992
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4. DBP telekom, cebit 1992
1 - DBP Telekom, Infobase 1991
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2. OPD frankfurt 1991
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3. DBP telekom isdn transfer 1992
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4. DBP telekom, cebit 1992