ARRANGEMENT FOR KEEPING AND SHOWING OF PLACARDS
TURKUTYUKOV VYACHESLAV B,SU, KOVALEV BORIS M,SU, DIGO RAISA N,SU, MOTAVKINA NONNA S,SU, KONDRATEV ALEKSANDR A,SU
Year of Publication 25.09.1979
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Year of Publication 25.09.1979
Patent