Masafumi Miyao

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Chuo-ku, Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Device for preventing leakage at pipe joints
- Patent number 4,346,922
- Issue date Aug 31, 1982
- Hisao Ohtsuga
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...