2356330

Information

• Patent Grant
• 2356330

• References
• Source

• Patent Number

  2,356,330

• Date Filed

  Not available

• Date Issued

  Tuesday, August 22, 1944
  79 years ago

• CPC

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

• US Classifications

  • 379 - Telephonic communications