2593512

Information

• Patent Grant
• 2593512

• References
• Source

• Patent Number

  2,593,512

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1952
  72 years ago

• CPC

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

• US Classifications

  • 379 - Telephonic communications
  • 236 - Automatic temperature and humidity regulation