1640992

Information

• Patent Grant
• 1640992

• References
• Source

• Patent Number

  1,640,992

• Date Filed

  Not available

• Date Issued

  Tuesday, August 30, 1927
  97 years ago

• CPC

  • B24B19/022 - for helicoidal grooves
  • Y10S451/915 - Abrading wheel speed control

• US Classifications

  • 451 - Abrading