Thereafter, Dopyera and his brothers began to make the tri-cone guitars in their Los Angeles shop, calling the new guitars "Nationals".
Dissatisfaction with what John Dopyera felt was mismanagement led him to resign from National in January 1929, and he subsequently formed the Dobro Manufacturing Corporation, later called Dobro Corporation, Ltd, and began to manufacture his own line of resonator-equipped instruments (dobros).
Patent infringement disagreements between National and Dobro led to a lawsuit in 1929 with Dobro suing National for ,000,000 in damages.
In 1925, Rickenbacker and two partners formed the Rickenbacker Manufacturing Company and incorporated it in 1927.
By the time he met George Beauchamp and began manufacturing metal bodies for the "Nationals" being produced by the National String Instruments Corporation, Rickenbacker was a highly skilled production engineer and machinist.
Nicknamed "frying pans" because of their long necks and circular bodies, the instruments were the first solid-bodied electric guitars, though they were a lap-steel type.
They had a single pickup with a steel cover that arched over the strings.During the early production of the A-22 Frying pan, Beauchamp and Rickenbacher would experiment with wooden-bodied Spanish guitars and solid body prototypes; ultimately giving birth to the "Electro-Spanish Model-B" and the "Electro-Spanish Ken Roberts".Both models had been experimental, produced as early as 1932 and officially released in 1935.Adolph Rickenbacher was born in Basel, Switzerland in 1887 and emigrated to the United States to live with relatives after the death of his parents.Sometime after moving to Los Angeles in 1918, he changed his surname to "Rickenbacker".As the problems at National became more apparent, Beauchamp's home experiments took on a more rigorous shape, and he began to attend night classes in electronics as well as collaborating with fellow National employee Paul Barth.