372090

Information

• Patent Grant
• 372090

• References
• Source

• Patent Number

  372,090

• Date Filed

  Not available

• Date Issued

  Tuesday, October 25, 1887
  137 years ago

• CPC

  • G04F1/063 - using acoustic signalling

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • D10 - Measuring, testing, or signalling instruments