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Kružni otvor za visoki tlak ZISD
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Unutarnje otvoreni CIWD kružnog okna
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Kružni šaht NLIW
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Atmosferski kružni šaht CNPE
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Sanitay šaht za atmosferski tlak NPDC
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Atmosferski kružni šaht NPDD
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Atmosferski kružni šaht CNPD
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Atmosferski kružni Manhol CNPC od nehrđajućeg čelika
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Kružni šaht od nehrđajućeg čelika u atmosferi SERC
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