"Originally, Electro String Instrument Corporation (ESIC) was the name of the parent company that produced "Rickenbacker" brand products. The "Electro" name was the main name, while it was "Rickenbacker" that was the pseudonym!
Other product names which were often made by ESIC include Ryder, Symphonia Grand, Academy, NHF, and Contello, but these were private label goods which might also have been made by other suppliers as well.
The only direct brand names that I recall being owned by the company are Rickenbacker, Electro, and Road (now owned by Celestion of England).
By the way as an historical aside, ESIC remains in existence today, as it's name was changed to Rickenbacker International Corporation as part of a series of corporate mergers, which happened only about 2 years ago, to reunite the various pieces of our guitar business."