1862689

Information

• Patent Grant
• 1862689

• References
• Source

• Patent Number

  1,862,689

• Date Filed

  Not available

• Date Issued

  Tuesday, June 14, 1932
  92 years ago

• CPC

  • H04Q1/48 - Induced-current signalling arrangements

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications