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%T Secrecy in the USSR and German Democratic Republic Patent Systems %A Martens, John A. %P 48 %D 2021 %K Soviet Union; German Democratic Republic; State Secrecy %> https://nbn-resolving.org/urn:nbn:de:0168-ssoar-74323-8 %C DEU %G en %9 Arbeitspapier %W GESIS - http://www.gesis.org %~ SSOAR - http://www.ssoar.info