1865200

Information

• Patent Grant
• 1865200

• References
• Source

• Patent Number

  1,865,200

• Date Filed

  Not available

• Date Issued

  Tuesday, June 28, 1932
  91 years ago

• CPC

  • H04Q5/06 - Signalling by amplitude or polarity of dc

• US Classifications

  • 379 - Telephonic communications