JPH0220178U - - Google Patents
Info
- Publication number
- JPH0220178U JPH0220178U JP3361488U JP3361488U JPH0220178U JP H0220178 U JPH0220178 U JP H0220178U JP 3361488 U JP3361488 U JP 3361488U JP 3361488 U JP3361488 U JP 3361488U JP H0220178 U JPH0220178 U JP H0220178U
- Authority
- JP
- Japan
- Prior art keywords
- manhole
- ultrasonic waves
- cover
- manhole cover
- closing
- 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
- 238000012806 monitoring device Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3361488U JPH0220178U (en]) | 1988-03-14 | 1988-03-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3361488U JPH0220178U (en]) | 1988-03-14 | 1988-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0220178U true JPH0220178U (en]) | 1990-02-09 |
Family
ID=31260305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3361488U Pending JPH0220178U (en]) | 1988-03-14 | 1988-03-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0220178U (en]) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2017204122A1 (ja) * | 2016-05-23 | 2018-09-20 | 株式会社日立システムズ | マンホール監視システム及び方法 |
-
1988
- 1988-03-14 JP JP3361488U patent/JPH0220178U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2017204122A1 (ja) * | 2016-05-23 | 2018-09-20 | 株式会社日立システムズ | マンホール監視システム及び方法 |