3869819

Information

• Patent Grant
• 3869819

• References
• Source

• Patent Number

  3,869,819

• Date Filed

  Not available

• Date Issued

  Tuesday, March 11, 1975
  50 years ago

• CPC

  • G03B23/046 - Picture changing devices
  • G02B27/025 - and magnifying means

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • D16 - Photography and optical equipment