2740956

Information

• Patent Grant
• 2740956

• References
• Source

• Patent Number

  2,740,956

• Date Filed

  Not available

• Date Issued

  Tuesday, April 3, 1956
  68 years ago

• CPC

  • G08B5/28 - with hinged flap or arm

• US Classifications

  • 340 - Communications: electrical
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets