Tadao Tsuruda

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Yokohama, JA

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Patents Grantslast 30 patents

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- Patent number 3,943,299
- Issue date Mar 9, 1976
- Hitachi, Ltd.
- Hiromi Moriyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone exchange system employing means capable of breaking a con...
- Patent number 3,941,952
- Issue date Mar 2, 1976
- Hitachi, Ltd.
- Hiromi Moriyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE