Minolta chronology (Sep. 1958)
Table in Shashin Kōgyō no.77 (September 1958), anonymously compiled by the Chiyoda Kōgaku Seikō company.
Document owned and scanned by rebollo_fr. It is in public domain, as are all anonymous works published more than fifty years ago in Japan.
See also the Camera-wiki page about Minolta.