1720364

Information

• Patent Grant
• 1720364

• References
• Source

• Patent Number

  1,720,364

• Date Filed

  Not available

• Date Issued

  Tuesday, July 9, 1929
  95 years ago

• CPC

  • E21F9/00 - Devices preventing sparking of machines or apparatus

• US Classifications

  • 310 - Electrical generator or motor structure
  • 299 - Mining or in situ disintegration of hard material