3667571

Information

• Patent Grant
• 3667571

• References
• Source

• Patent Number

  3,667,571

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1972
  52 years ago

• CPC

  • F01B31/005 - Silencing equipment
  • E21B7/025 - Rock drills
  • Y10S173/02 - Sound muffling

• US Classifications

  • 181 - Acoustics
  • 173 - Tool driving or impacting