1378990

Information

• Patent Grant
• 1378990

• References
• Source

• Patent Number

  1,378,990

• Date Filed

  Not available

• Date Issued

  Tuesday, May 24, 1921
  104 years ago

• CPC

  • G08B5/32 - with indicator element moving rectilinearly

• US Classifications

  • 340 - Communications: electrical