1390907

Information

• Patent Grant
• 1390907

• References
• Source

• Patent Number

  1,390,907

• Date Filed

  Not available

• Date Issued

  Tuesday, September 13, 1921
  103 years ago

• CPC

  • G04C21/32 - giving indications at a number of places each at a different time

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications
  • 968 - Horology