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Sergei N. Vlasov
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Moscow, SU
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last 30 patents
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Patent Grant
Shuttering for erecting a concrete tunnel lining
Patent number
4,315,701
Issue date
Feb 16, 1982
Valentin A. Ivanov
E21 - EARTH DRILLING MINING
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Patent Grant
Shield for constructing tunnels with in-situ formed concrete lining
Patent number
4,222,681
Issue date
Sep 16, 1980
Vladimir A. Khodosh
E21 - EARTH DRILLING MINING