1871636

Information

• Patent Grant
• 1871636

• References
• Source

• Patent Number

  1,871,636

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1932
  92 years ago

• CPC

  • H04M11/00 - Telephonic communication systems adapted for combination with other electrical systems
  • G04C13/022 - via existing power distribution lines
  • G04C21/12 - by electro-acoustic means

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 340 - Communications: electrical
  • 455 - Telecommunications
  • 968 - Horology