2923931

Information

• Patent Grant
• 2923931

• References
• Source

• Patent Number

  2,923,931

• Date Filed

  Not available

• Date Issued

  Tuesday, February 2, 1960
  64 years ago

• CPC

  • G10K1/341 - for a still-standing bell

• US Classifications

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