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Rudolf G. Isupov
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Leningrad, SU
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Patent Grant
Trenching machine for cutting preferably frozen ground
Patent number
4,432,584
Issue date
Feb 21, 1984
Leningradskoe Nauchno-Proizvodstvennoe Obiedinenie Zemleroinogo Mashinostroenia
Stepan K. Vartanov
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING