| Patent | Registration | |
| Depth measurement equipment of buried metallic pipe | PAT | 2033693 |
| Detection equipment of leak noise | PAT | JPN: 3223337, 3191129 UK: 2276515 USA: 5602327 |
| Distinction method of leakage generation | PAT | 2887443 |
| Detection equipment of vibration and its noise absorbing part | PAT | JPN: PAT.P UK: 2325790 USA: 5959210 |
| Location method of buried object and its equipment | PAT.P | |
| Edition and management method for position information of subsurface buried things and the medium recording the program | PAT.P | |
| Information managing equipment and the receptacle for information logging medium | PAT.P | |
| Flow direction and speed meter | PAT.P | |
| Detection equipment of water leak noise | PAT.P | |
| Metal locator | PAT.P | |
| Detection method of metal by metal locator | PAT.P | |
| New design for practical use | Registration | |
| Water pressure testing equipment | Approved | 3054200 |
| Support component for indicating part of buried pipe | Approved | 3079511 |
| Registration of a design | Registration | |
| Holder plate of recording medium of valve data | Approved | 1164702 1172320 1172466 1172467 1172321 1172468 1172322 |
