Removable disk cartridge with improved hub locking mechanism
Removable disk construction
Removable disk to drive engagement
Resettable single play tape cassette
Resilient protrusion for positioning in a spool of a magnetic ta
Resinous disc cartridge containing an ester compound of glycerin
Restraining and sealing mechanism for disc cartridge
Reusable record tab for videotape cassette
Ribbed cleaning apparatus for disk cartridges
Rotatable door and door opening mechanism for a cartridge