3820105

Information

• Patent Grant
• 3820105

• References
• Source

• Patent Number

  3,820,105

• Date Filed

  Not available

• Date Issued

  Tuesday, June 25, 1974
  50 years ago

• CPC

  • G04C21/20 - by closing a contact to ring an electro-mechanical alarm
  • G04C21/36 - Signal repeating devices

• US Classifications

  • 340 - Communications: electrical
  • 968 - Horology