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Keywords from Image Description:
Salausviivain VLDHA Kokonaisturvallisuus . en Finnish military World War VLDHA cryptographic slide rule Photographed at Finnish military museum exhibition stall at Comprehensive security exhibition in Tampere fi Suomalainen toisessa maailmansodassa kytetty salausviivain VLDHA matolaatikko Kuvattu Sotamuseon osastolla Kokonaisturvallisuus