3137221

Information

• Patent Grant
• 3137221

• References
• Source

• Patent Number

  3,137,221

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1964
  60 years ago

• CPC

  • G03B41/023 - combined with shutter

• US Classifications

  • 352 - Optics: motion pictures
  • 396 - Photography