1979837

Information

• Patent Grant
• 1979837

• References
• Source

• Patent Number

  1,979,837

• Date Filed

  Not available

• Date Issued

  Tuesday, November 6, 1934
  90 years ago

• CPC

  • F21L23/00 - Non-electric hand-lamps for miners

• US Classifications

  • 340 - Communications: electrical
  • 073 - Measuring and testing
  • 337 - Electricity: electrothermally or thermally actuated switches
  • 362 - Illumination