1900689

Information

• Patent Grant
• 1900689

• References
• Source

• Patent Number

  1,900,689

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1933
  91 years ago

• CPC

  • B64C39/006 - about a vertical axis

• US Classifications

  • 244 - Aeronautics and astronautics
  • 416 - Fluid reaction surfaces