JPH01121806U - - Google Patents

Info

Publication number

JPH01121806U

JPH01121806U JP1706388U JP1706388U JPH01121806U JP H01121806 U JPH01121806 U JP H01121806U JP 1706388 U JP1706388 U JP 1706388U JP 1706388 U JP1706388 U JP 1706388U JP H01121806 U JPH01121806 U JP H01121806U

Authority

JP

Japan

Prior art keywords

steel pipe

polarizing filter

detection device

detecting

utility

Prior art date

1988-02-12

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

• 229910000831 Steel Inorganic materials 0.000 claims description 4
• 239000010959 steel Substances 0.000 claims description 4
• 238000001514 detection method Methods 0.000 claims description 3
• 239000003973 paint Substances 0.000 claims description 3
• 230000003287 optical effect Effects 0.000 claims 1
• 238000010586 diagram Methods 0.000 description 2
• 238000005096 rolling process Methods 0.000 description 1