1523468

Information

• Patent Grant
• 1523468

• References
• Source

• Patent Number

  1,523,468

• Date Filed

  Not available

• Date Issued

  Tuesday, January 20, 1925
  100 years ago

• CPC

  • H04M1/32 - Locking setting devices during transmission to prevent interference by user

• US Classifications

  • 379 - Telephonic communications
  • D14 - Recording, communication, or information retrieval equipment