1945977

Information

• Patent Grant
• 1945977

• References
• Source

• Patent Number

  1,945,977

• Date Filed

  Not available

• Date Issued

  Tuesday, February 6, 1934
  90 years ago

• CPC

  • G03B41/04 - with optical compensator

• US Classifications

  • 355 - Photocopying
  • 359 - Optical: systems and elements