1774465

Information

• Patent Grant
• 1774465

• References
• Source

• Patent Number

  1,774,465

• Date Filed

  Not available

• Date Issued

  Tuesday, August 26, 1930
  94 years ago

• CPC

  • H04R9/042 - by pressurised air

• US Classifications

  • 381 - Electrical audio signal processing systems and devices