3640611

Information

• Patent Grant
• 3640611

• References
• Source

• Patent Number

  3,640,611

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  52 years ago

• CPC

  • G03B21/34 - Change-over arrangements
  • G03B1/42 - Guiding, framing, or constraining film in desired position relative to lens system

• US Classifications

  • 352 - Optics: motion pictures