2553556

Information

• Patent Grant
• 2553556

• References
• Source

• Patent Number

  2,553,556

• Date Filed

  Not available

• Date Issued

  Tuesday, May 22, 1951
  73 years ago

• CPC

  • H04L17/06 - Contact operating means

• US Classifications

  • 178 - Telegraphy
  • 315 - Electric lamp and discharge devices: systems
  • 340 - Communications: electrical