1845571

Information

• Patent Grant
• 1845571

• References
• Source

• Patent Number

  1,845,571

• Date Filed

  Not available

• Date Issued

  Tuesday, February 16, 1932
  93 years ago

• CPC

  • H04M17/02 - Coin-freed or check-freed systems
  • H04Q1/48 - Induced-current signalling arrangements

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications