2830491

Information

• Patent Grant
• 2830491

• References
• Source

• Patent Number

  2,830,491

• Date Filed

  Not available

• Date Issued

  Tuesday, April 15, 1958
  67 years ago

• CPC

  • G01C11/14 - with optical projection

• US Classifications

  • 355 - Photocopying
  • 352 - Optics: motion pictures