1457338

Information

• Patent Grant
• 1457338

• References
• Source

• Patent Number

  1,457,338

• Date Filed

  Not available

• Date Issued

  Tuesday, June 5, 1923
  101 years ago

• CPC

  • H04M5/12 - Ringing or otherwise calling substations

• US Classifications

  • 379 - Telephonic communications