3881815

Information

• Patent Grant
• 3881815

• References
• Source

• Patent Number

  3,881,815

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1975
  49 years ago

• CPC

  • G03B23/08 - in which pictures are attached to a movable carrier
  • G09B5/02 - with visual presentation of the material to be studied

• US Classifications

  • 353 - Optics: image projectors