JPH01102789U - - Google Patents
Info
- Publication number
- JPH01102789U JPH01102789U JP19787287U JP19787287U JPH01102789U JP H01102789 U JPH01102789 U JP H01102789U JP 19787287 U JP19787287 U JP 19787287U JP 19787287 U JP19787287 U JP 19787287U JP H01102789 U JPH01102789 U JP H01102789U
- Authority
- JP
- Japan
- Prior art keywords
- sign
- detection signal
- marker
- underground
- response
- Prior art date
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 239000003550 marker Substances 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 2
- 238000009933 burial Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Geophysics And Detection Of Objects (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19787287U JPH01102789U (en]) | 1987-12-25 | 1987-12-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19787287U JPH01102789U (en]) | 1987-12-25 | 1987-12-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01102789U true JPH01102789U (en]) | 1989-07-11 |
Family
ID=31488404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19787287U Pending JPH01102789U (en]) | 1987-12-25 | 1987-12-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01102789U (en]) |
-
1987
- 1987-12-25 JP JP19787287U patent/JPH01102789U/ja active Pending