1912392

Information

• Patent Grant
• 1912392

• References
• Source

• Patent Number

  1,912,392

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1933
  91 years ago

• CPC

  • G09F21/16 - Sky-writing

• US Classifications

  • 244 - Aeronautics and astronautics
  • 040 - Card, picture, or sign exhibiting