1371749

Information

• Patent Grant
• 1371749

• References
• Source

• Patent Number

  1,371,749

• Date Filed

  Not available

• Date Issued

  Tuesday, March 15, 1921
  103 years ago

• CPC

  • H04M5/12 - Ringing or otherwise calling substations

• US Classifications

  • 379 - Telephonic communications