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MOM: http://szextant. blogspot. hu/2014/03/mom-magyar-optikai-muvek.
M. O. M. (?) * * * * Although there is a Tesla plug on this one, several people have indicated that this is probably not a Tesla microphone, but is from a M. O. M. tape recorder (Magyar Optikai Muvek - Hungary). It does have a Ronette Filtercell element inside.
" The company got under ifluence of Carl Zeiss Jena and C. P. Goerz. Between 1926 and 1932 company produced radio models too. In 1934 company was renamed to "Magyar Optikai Muvek Rt. " In 1937 company produced some optical devices for GB Army, during WW2 for German Army, for example some tank`s optics. Between 1945-1952 under Soviet management, company was in very poor situation. Since 1955 the production was growing up, since 1960 began production of laboratory equipment too.