2489804

Information

• Patent Grant
• 2489804

• References
• Source

• Patent Number

  2,489,804

• Date Filed

  Not available

• Date Issued

  Tuesday, November 29, 1949
  75 years ago

• CPC

  • G03B27/66 - specially adapted for holding half-tone screens

• US Classifications

  • 396 - Photography
  • 355 - Photocopying