* Foreign:

AEG (GERMANY) > Ko-on (different appearance), Central/Fuji Central (similar mechanism)

ERNEMANN (GERMANY) > Excellent, Mikuni, Royal, Rola, New Star (nearly exact copies)

RCA (U.S.A.) > Nichion [Patented], TP (TOSHIBA PHOTO PHONE) [Patented], NIVICO (JVC) [owns rights]

Century (U.S.A.) > Daiichi Onkyo (soundheads only) [Imported genuinely]

Simplex (U.S.A.) > Rola, Nissey (different mechanism)

GAUMONT-KALEE (U.K.) > SUPER (FUJI DENKI KOGYO)

* Domestic:

Royal > CINEFORWARD

Central/Fuji Central > General, Tokiwa