| ABB Automation GmbH |
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Process control engineering |
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| BASF SE |
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Process control engineering, building services engineering, low and medium voltage cable installations, DGUV Regulation 3 |
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| Bilfinger Industrietechnik Salzburg GmbH |
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Process control engineering |
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| Bosch Sicherheitssysteme GmbH |
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Building services engineering |
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| Deutsche Asphalt GmbH |
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Building services engineering |
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| Haltermann Carless Deutschland GmbH |
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Process control engineering, medium voltage cable installations |
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| INEOS Styrolution Ludwigshafen GmbH |
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Process control engineering, building services engineering |
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| Infraserv GmbH & Co. KG |
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Medium voltage cable installations |
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| Mann+Hummel GmbH |
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Building services engineering |
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| Merck KGaA |
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Process control engineering, DGUV Regulation 3 |
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| Minera Kraftstoffe - Mineralölwerk Rempel GmbH |
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Process control engineering, DGUV Regulation 3 |
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| ms Neumann Elektronik GmbH |
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Process control engineering |
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| Novindustra AG |
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DGUV Regulation 3 |
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| REMCON Electrical Co. L.L.C. |
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Medium and high voltage cable installations |
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| Siemens AG |
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Medium and high voltage cable installations |
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| Südkabel GmbH |
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Medium and high voltage cable installations |
