SOLID ROOF CONTROL METHOD
LOPUKHOV NIKOLAJ M,SU, BOGDANOV MIKHAIL ,SU, GAPANOVICH LEONID N,SU, SMORCHKOV YURIJ P,SU, LANIN EDUARD ,SU, SHISHKIN VLADIMIR P,SU
Year of Publication 15.12.1980
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Year of Publication 15.12.1980
Patent