2376352

Information

• Patent Grant
• 2376352

• References
• Source

• Patent Number

  2,376,352

• Date Filed

  Not available

• Date Issued

  Tuesday, May 22, 1945
  79 years ago

• CPC

  • H04Q1/4535 - with an additional signal transmitted for voice protection

• US Classifications

  • 379 - Telephonic communications