2429641

Information

• Patent Grant
• 2429641

• References
• Source

• Patent Number

  2,429,641

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1947
  77 years ago

• CPC

  • G08B5/28 - with hinged flap or arm

• US Classifications

  • 379 - Telephonic communications
  • 324 - Electricity: measuring and testing