1957537

Information

• Patent Grant
• 1957537

• References
• Source

• Patent Number

  1,957,537

• Date Filed

  Not available

• Date Issued

  Tuesday, May 8, 1934
  90 years ago

• CPC

  • H04J7/02 - in which the polarity of the amplitude is characteristic

• US Classifications

  • 381 - Electrical audio signal processing systems and devices
  • 332 - Modulators