3592972

Information

• Patent Grant
• 3592972

• References
• Source

• Patent Number

  3,592,972

• Date Filed

  Not available

• Date Issued

  Tuesday, July 13, 1971
  53 years ago

• CPC

  • H04M1/278 - using punched cards or tapes

• US Classifications

  • 379 - Telephonic communications
  • 235 - Registers