1901423

Information

• Patent Grant
• 1901423

• References
• Source

• Patent Number

  1,901,423

• Date Filed

  Not available

• Date Issued

  Tuesday, March 14, 1933
  92 years ago

• CPC

  • G03B27/581 - in copying cameras

• US Classifications

  • 355 - Photocopying
  • 396 - Photography