3474556

Information

• Patent Grant
• 3474556

• References
• Source

• Patent Number

  3,474,556

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1969
  55 years ago

• CPC

  • G09B29/108 - involving the optical projection of slides, microfilm or the like
  • G01C21/22 - Plotting boards
  • G01S1/02 - using radio waves

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 342 - Communications: directive radio wave systems and devices