3815985

Information

• Patent Grant
• 3815985

• References
• Source

• Patent Number

  3,815,985

• Date Filed

  Not available

• Date Issued

  Tuesday, June 11, 1974
  50 years ago

• CPC

  • G05B19/16 - using magnetic record carriers
  • G03B23/00 - Devices for changing pictures in viewing apparatus or projectors
  • G03B31/06 - in which sound track is associated with successively-shown still pictures

• US Classifications

  • 353 - Optics: image projectors