3127481

Information

• Patent Grant
• 3127481

• References
• Source

• Patent Number

  3,127,481

• Date Filed

  Not available

• Date Issued

  Tuesday, March 31, 1964
  61 years ago

• CPC

  • H04R19/04 - Microphones
  • G01P15/125 - by capacitive pick-up
  • H04R19/10 - signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

• US Classifications

  • 369 - Dynamic information storage or retrieval
  • 381 - Electrical audio signal processing systems and devices