Haruyuki Atsumi

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for closing fireproof doors
- Patent number 4,715,146
- Issue date Dec 29, 1987
- Ryobi Limited
- Haruyuki Atsumi
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Fireproof door closer and holder having a solenoid and a toggle mec...
- Patent number 4,656,690
- Issue date Apr 14, 1987
- Ryobi Limited
- Fujio Katagiri
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES