2156010

Information

• Patent Grant
• 2156010

• References
• Source

• Patent Number

  2,156,010

• Date Filed

  Not available

• Date Issued

  Tuesday, April 25, 1939
  85 years ago

• CPC

  • G09F21/16 - Sky-writing

• US Classifications

  • 040 - Card, picture, or sign exhibiting
  • 123 - Internal-combustion engines