Argentinian factory dedicated to production of cassette cases. Earliest known date of activity is 1983. It is unknown if it's involved in duplication of cassette tapes, at the very least it produced the plastic cases. Part of Electrosonora Manufacturas Saavedra S.A. / BMG Electrosonora Manufacturas Saavedra S.A. company, factory was closed together with the company somewhere in 1998/1999
Usual credit on print is "Fab. EMSSA San Luis", "Manufacturado por EMSSA San Luis" and variants thereof. Credit this company if the logotype/print "EMSSA" or "EMSA" is found engraved on the plastic mold of cassettes.
At least one release has use E.M.S.S.A. brand cassette cases has been after the company stopped production.