References
Russian Federation Inventor's Certificate 1,416,665; IPC E 21 B 33/03. Christmas Tree.
Additional information
Soyuzneftemash Joint Stock Company (AO). Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 5, pp. 16–17, May, 1998.
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Arifulin, R.K. New christmas tree arrangement. Chem Petrol Eng 34, 315–316 (1998). https://doi.org/10.1007/BF02418801
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DOI: https://doi.org/10.1007/BF02418801