1131991

Information

• Patent Grant
• 1131991

• References
• Source

• Patent Number

  1,131,991

• Date Filed

  Not available

• Date Issued

  Tuesday, March 16, 1915
  109 years ago

• CPC

  • B23B51/02 - Twist drills
  • B23B2251/247 - Drilling tools having a working portion at both ends of the shank
  • Y10T408/9097 - Spiral channel
  • Y10T408/9098 - with means to retain Tool to support

• US Classifications

  • 408 - Cutting by use of rotating axially moving tool