213999

Information

• Patent Grant
• 213999

• References
• Source

• Patent Number

  213,999

• Date Filed

  Not available

• Date Issued

  Tuesday, April 8, 1879
  145 years ago

• CPC

  • G04B21/005 - Periodical acoustic signalling arrangements

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 116 - Signals and indicators