2021438

Information

• Patent Grant
• 2021438

• References
• Source

• Patent Number

  2,021,438

• Date Filed

  Not available

• Date Issued

  Tuesday, November 19, 1935
  89 years ago

• CPC

  • B64C39/006 - about a vertical axis

• US Classifications

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