1975 Sony AM-FM Radio Stereo Cassette-Corder CF-540 Analog Audio, Compact Cassette, Gyártók, Magnó, Rádió-magnó Sony CF-540 Service Manual
1969 National Solid State 4 Track System Portable Tape Recorder RQ-194S Analog Audio, Gyártók, Magnó, Orsós-szalagos National RQ-194S Operating Instructions
