3514540

Information

• Patent Grant
• 3514540

• References
• Source

• Patent Number

  3,514,540

• Date Filed

  Not available

• Date Issued

  Tuesday, May 26, 1970
  54 years ago

• CPC

  • H04M15/28 - with meter at substation or with calculation of charges at terminal
  • C06F3/08 - Strike-surface compositions
  • H04M15/04 - Recording calls , or communications in printed, perforated or other permanent form
  • H04M15/06 - Recording class or number of calling

• US Classifications

  • 379 - Telephonic communications