1923973

Information

• Patent Grant
• 1923973

• References
• Source

• Patent Number

  1,923,973

• Date Filed

  Not available

• Date Issued

  Tuesday, August 22, 1933
  91 years ago

• CPC

  • B64C39/006 - about a vertical axis

• US Classifications

  • 244 - Aeronautics and astronautics