Cassette Tape Recorders - A New Breed, June 1969 Electronics World - RF Cafe

1969 Norelco Cassette Recorder Vintage Ad take to work

Cassette Tape Recorders - A New Breed, June 1969 Electronics World

Cathode-ray tube - Wikipedia

Mac's Radio Service Shop: Looking Forward and Backward, March 1951

Mac's Radio Service Shop: Unusual New Equipment - RF Cafe

The first stereo cassette recorder - 1966 Philips EL3312 / Norelco

Vintage Electronics World Magazine Articles - RF Cafe

Vintage Technics. Accessories

Mac's Service Shop: Keeping up with New Components, February 1966

The Walkman is introduced, July 1, 1979 - EDN