Municipal limited lability company “Ūdeka”
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JSC Siltumelektroprojekts”
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Municipal limited liability company “Ventspils labiekārtošanas kombināts”
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"Ziemelvidzemes Atkritumu Apsaimniekosanas Organizacija" LTD
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“Inženiertehniskie projekti” LTD
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JSC “Lenmorniiprojekt” (Russia)
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JSC “Ļengipotrans” (Russia)
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JSC “Veikals Meliorators”
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