1921893

Information

• Patent Grant
• 1921893

• References
• Source

• Patent Number

  1,921,893

• Date Filed

  Not available

• Date Issued

  Tuesday, August 8, 1933
  92 years ago

• CPC

  • B64D35/06 - the propellers or rotors being counter-rotating
  • B64D2700/62824 - co-rotating
  • Y10T74/19121 - Concentric

• US Classifications

  • 074 - Machine element or mechanism