1997477

Information

• Patent Grant
• 1997477

• References
• Source

• Patent Number

  1,997,477

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  90 years ago

• CPC

  • H01H50/72 - for mercury contact

• US Classifications

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