The Veljekset Karhumäki O/Y company had been formed in 1924 and concerned itself with licence manufacturing. In 1948 the company designed and built a prototype of the Karhu 48, a high-wing four-seat monoplane of mixed construction, with a fabric-covered steel-tube fuselage and fabric-covered wooden wings.
The Karhumäki Brothers Ltd. company was established in 1924 and specialized in license manufacturing. In 1948, the firm designed and constructed a prototype of the Karhu 48, a high-wing four-seat monoplane with a mixed construction, featuring a steel-tube fuselage covered in fabric and wooden wings also covered in fabric.