3483328

Information

• Patent Grant
• 3483328

• References
• Source

• Patent Number

  3,483,328

• Date Filed

  Not available

• Date Issued

  Tuesday, December 9, 1969
  54 years ago

• CPC

  • H04M15/18 - according to duration of the call , or the communication
  • H04M15/04 - Recording calls , or communications in printed, perforated or other permanent form

• US Classifications

  • 379 - Telephonic communications