1930137

Information

• Patent Grant
• 1930137

• References
• Source

• Patent Number

  1,930,137

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1933
  91 years ago

• CPC

  • G01J1/4219 - specially adapted for enlargers

• US Classifications

  • 355 - Photocopying
  • 250 - Radiant energy