2151817

Information

• Patent Grant
• 2151817

• References
• Source

• Patent Number

  2,151,817

• Date Filed

  Not available

• Date Issued

  Tuesday, March 28, 1939
  85 years ago

• CPC

  • G03F1/88 - prepared by photographic processes for production of originals simulating relief

• US Classifications

  • 355 - Photocopying