2643187

Information

• Patent Grant
• 2643187

• References
• Source

• Patent Number

  2,643,187

• Date Filed

  Not available

• Date Issued

  Tuesday, June 23, 1953
  71 years ago

• CPC

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

• US Classifications

  • 355 - Photocopying
  • 396 - Photography