1997902

Information

• Patent Grant
• 1997902

• References
• Source

• Patent Number

  1,997,902

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1935
  89 years ago

• CPC

  • H01T13/28 - having spherically shaped electrodes

• US Classifications

  • 313 - Electric lamp and discharge devices