IMPROVEMENTS IN OR RELATING TO GYROSCOPIC COMPASSES von EDUARD ALEXANDROVICH LABETSKY, BORIS FEODOROVICH ERMILOV, VLADIMIR NIKOLAEVICH LAVROV, IZRAIL BORISOVICH ZHITOMIRSKY, JURY SERGEEVICH LUKOVATY, PETR YAKOVLEVICH GALPERIN, JURY IVANOVICH CHISTYAKOV

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