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Abstract of German Democratic Eepublic Patent No. 86461, cl. 49 h, 34/01, June 26, 1965.
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, p, 42, November, 1969.
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Petukhova, Z.B. Device fob welding laege sections. Chem Petrol Eng 5, 920 (1969). https://doi.org/10.1007/BF01371783
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DOI: https://doi.org/10.1007/BF01371783