1935: Audio recorder uses low-cost magnetic tape

Paper-backed Soundmirror 'magnetic ribbon' - early domestic magnetic tape recorders

Reel to Reel Tape Recorder Manufacturers - Craig tape recorders- Museum of Magnetic Sound Recording

Lecture 2: Steinmetz and the Hysteresis Motor

The Reel History of Analog Tape Recording

Concord Sound Camera Model F-20 Reel To Reel Portable Recorder Player

24 Inventions That Changed Music

Magnetic Tape for Audio Museum of Obsolete Media

From Wax Casts to Podcasts: The Evolution of Audio - Vox

Magnetic Recording/Audiocassette - body, used, system, air, waves, History of magnetic recording