2087576

Information

• Patent Grant
• 2087576

• References
• Source

• Patent Number

  2,087,576

• Date Filed

  Not available

• Date Issued

  Tuesday, July 20, 1937
  87 years ago

• CPC

  • G08B5/28 - with hinged flap or arm

• US Classifications

  • 340 - Communications: electrical
  • 174 - Electricity: conductors and insulators