Magnetic thin film magnetic recording medium

Magnetic-tape cassette and reel-locking device suitable for use

Magnetic-tape cassette comprising a pressure-member support, and

Magnetic-tape cassette having a capstan cleaning device

Magnetic-tape cassette having an element for cleaning a tape dri

Magnetic-tape cassette with pivotal, nesting cover

Magnetically indelible media type identification system

Magneto-optic recording medium

Magneto-optical recording medium

Magneto-optical recording medium

Magneto-optical recording medium

Magneto-optical recording medium having alternately-layered high

Magneto-optical recording medium having recording guide tracks

Magnetooptic memory medium

Mask for magnetic tape cassettes

Mask structure for cassettes of magnetic tape

Means and method for clamping a disk pack

Means for adhering the magnetic disk to the center core in a mag

Means for visualization of rotary movement in tape cassettes

Mechanism for locking tape reel in magnetic tape cassette