2276447

Information

• Patent Grant
• 2276447

• References
• Source

• Patent Number

  2,276,447

• Date Filed

  Not available

• Date Issued

  Tuesday, March 17, 1942
  82 years ago

• CPC

  • H04Q3/0016 - Arrangements providing connection between exchanges
  • H04Q1/48 - Induced-current signalling arrangements

• US Classifications

  • 379 - Telephonic communications