3884575

Information

• Patent Grant
• 3884575

• References
• Source

• Patent Number

  3,884,575

• Date Filed

  Not available

• Date Issued

  Tuesday, May 20, 1975
  49 years ago

• CPC

  • G03B27/722 - when the reproduction scale is changed
  • G03B27/727 - Optical projection devices wherein the contrast is controlled optically (

• US Classifications

  • 355 - Photocopying