Collection History Museum of Magnetic Sound Recording

Fundamentals of AV Preservation - Chapter 1 — NEDCC

Museum of Magnetic Sound Recording - interview with Martin Theophilus

Tape recorder - Wikipedia

Fundamentals of AV Preservation - Chapter 1 — NEDCC

Collection History Museum of Magnetic Sound Recording

Museum of Magnetic Sound Recording

Martin Theophilus of The Museum of Magnetic Sound Recording, Part Two – PS Audio

National Museum of American History

Museum of Magnetic Sound Recording - interview with Martin Theophilus

Retro Audio Museum

Stories - Museum of Magnetic Sound Recording

Phantom Productions reel to reel tape recorder 1908 ad collection

Collection History Museum of Magnetic Sound Recording

Martin Theophilus of The Museum of Magnetic Sound Recording, Part Two – PS Audio