1857473

Information

• Patent Grant
• 1857473

• References
• Source

• Patent Number

  1,857,473

• Date Filed

  Not available

• Date Issued

  Tuesday, May 10, 1932
  92 years ago

• CPC

  • B64C11/005 - Spiral-shaped propellers

• US Classifications

  • 244 - Aeronautics and astronautics