2425801

Information

• Patent Grant
• 2425801

• References
• Source

• Patent Number

  2,425,801

• Date Filed

  Not available

• Date Issued

  Tuesday, August 19, 1947
  77 years ago

• CPC

  • H04L19/00 - Apparatus or local circuits for step-by-step systems
  • H04M1/57 - Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set

• US Classifications

  • 345 - Computer graphics processing and selective visual display systems
  • 178 - Telegraphy
  • 315 - Electric lamp and discharge devices: systems
  • 370 - Multiplex communications