1787382

Information

• Patent Grant
• 1787382

• References
• Source

• Patent Number

  1,787,382

• Date Filed

  Not available

• Date Issued

  Tuesday, December 30, 1930
  94 years ago

• CPC

  • G08B5/28 - with hinged flap or arm

• US Classifications

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