1864442

Information

• Patent Grant
• 1864442

• References
• Source

• Patent Number

  1,864,442

• Date Filed

  Not available

• Date Issued

  Tuesday, June 21, 1932
  92 years ago

• CPC

  • G01J1/4219 - specially adapted for enlargers

• US Classifications

  • 396 - Photography
  • 250 - Radiant energy
  • 355 - Photocopying