2021099

Information

• Patent Grant
• 2021099

• References
• Source

• Patent Number

  2,021,099

• Date Filed

  Not available

• Date Issued

  Tuesday, November 12, 1935
  89 years ago

• CPC

  • H04Q9/08 - Calling by using continuous ac
  • Y10T307/461 - Selectively connected or controlled load circuits

• US Classifications

  • 340 - Communications: electrical
  • 307 - Electrical transmission or interconnection systems