The cameras were furnished with whatever lensmount was necessary: screw-thread, K-mount, Canon, Nikon or Olympus bayonet. As listed last column, and slightly expanded here, the major camera brands using one or more Cosina-made SLRs included Argus, Bauer, Canon, Exakta, Hanimex, Miranda, Nikon, Petri, Quantaray, Soligor, Vivitar.
(Yes, yes, yes, I know that Chinon and Ricoh also made basic SLRs for many companies, but we have reason right now to follow Cosina's ventures.)
Then came the digital onslaught. Virtually all Cosina-made 35mm film SLRs were obsolete antiques, not needed by the major-brand camera companies.