JPH01175115U - - Google Patents

Info

Publication number

JPH01175115U

JPH01175115U JP7071588U JP7071588U JPH01175115U JP H01175115 U JPH01175115 U JP H01175115U JP 7071588 U JP7071588 U JP 7071588U JP 7071588 U JP7071588 U JP 7071588U JP H01175115 U JPH01175115 U JP H01175115U

Authority

JP

Japan

Prior art keywords

drilling

projecting portion

core bit

diamond core

drilled

Prior art date

1988-05-27

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

• 229910003460 diamond Inorganic materials 0.000 claims description 3
• 239000010432 diamond Substances 0.000 claims description 3
• 239000000463 material Substances 0.000 claims description 2
• 238000005553 drilling Methods 0.000 claims 3
• 230000002265 prevention Effects 0.000 claims 1