The best modern magnetic tapes, so called "Metal-Particle Tapes", are based on tiny elongated iron particles.
(The best modern magnetic tapes; so called; Metal-Particle Tapes) (The best modern magnetic tapes, so called "Metal-Particle Tapes",; are based; on tiny elongated iron particles)
The best modern magnetic tapes The best modern magnetic tapes, so called "Metal-Particle Tapes",
so called are based
Metal-Particle Tapes
on tiny elongated iron particles