619449

Information

• Patent Grant
• 619449

• References
• Source

• Patent Number

  619,449

• Date Filed

  Not available

• Date Issued

  Tuesday, February 14, 1899
  125 years ago

• CPC

  • G08B13/04 - by breaking of glass
  • E05B45/086 - by transverse movement

• US Classifications

  • 340 - Communications: electrical