2112951

Information

• Patent Grant
• 2112951

• References
• Source

• Patent Number

  2,112,951

• Date Filed

  Not available

• Date Issued

  Tuesday, April 5, 1938
  87 years ago

• CPC

  • G06F7/443 - by successive additions or subtractions
  • H04M3/36 - Statistical metering
  • H04M15/04 - Recording calls , or communications in printed, perforated or other permanent form

• US Classifications

  • 379 - Telephonic communications
  • 235 - Registers