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EVS-EN 253:1997 Eelisoleeritud seotud torusüsteemid maa-alustele kuumaveevõrkudele : terastöötorust, polüuretaanist soojusisolatsioonikihist ja polüetüleenümbristorust koosnev eelisoleeritud toru = Preinsulated bonded pipe systems for underground hot w...
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