2223927

Information

• Patent Grant
• 2223927

• References
• Source

• Patent Number

  2,223,927

• Date Filed

  Not available

• Date Issued

  Tuesday, December 3, 1940
  84 years ago

• CPC

  • H04M1/52 - Arrangements wherein a dial or equivalent is mechanically coupled to a line selector
  • H04M1/57 - Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
  • H04M3/64 - Arrangements for signalling the number or class of the calling line to the operator
  • H04M9/003 - Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set

• US Classifications

  • 379 - Telephonic communications