Fernmeldetechnik Manfred Petri |
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Provinzialstr. 86 44388 Dortmund 0231 634030 |
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franke & fries Kommunikations- und Meldesysteme |
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Hildebrandstr. 16 44319 Dortmund 0231 5569210 |
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TELENORMA Telefonbau und Normalzeit Lehner & Co. |
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Deggingstr. 93 44141 Dortmund 0231 5414-00 |
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