JPS63108489U - - Google Patents

Info

Publication number

JPS63108489U

JPS63108489U JP19896086U JP19896086U JPS63108489U JP S63108489 U JPS63108489 U JP S63108489U JP 19896086 U JP19896086 U JP 19896086U JP 19896086 U JP19896086 U JP 19896086U JP S63108489 U JPS63108489 U JP S63108489U

Authority

JP

Japan

Prior art keywords

cutter

chevron

concave curved

curved surface

cutting edge

Prior art date

1986-12-27

Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Pending

Links

• Espacenet
• Global Dossier
• Discuss

• 238000009412 basement excavation Methods 0.000 claims description 7
• 238000010586 diagram Methods 0.000 description 4
• 238000005553 drilling Methods 0.000 description 1

Cited By (3)