1390704

Information

• Patent Grant
• 1390704

• References
• Source

• Patent Number

  1,390,704

• Date Filed

  Not available

• Date Issued

  Tuesday, September 13, 1921
  103 years ago

• CPC

  • E05B45/04 - with detonating alarm devices

• US Classifications

  • 116 - Signals and indicators
  • 340 - Communications: electrical