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Commutator
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Patent number 5,266,860
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Issue date Nov 30, 1993
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Hitachi, Ltd.
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Akio Chiba
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Slip casting method
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Patent number 5,252,273
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Issue date Oct 12, 1993
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Hitachi, Ltd.
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Junji Sakai
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B28 - WORKING CEMENT, CLAY, OR STONE
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Rollers for rolling mills
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Patent number 4,941,251
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Issue date Jul 17, 1990
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Hitachi, Ltd.
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Masahisa Sobue
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Rollers for rolling mills
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Patent number 4,839,949
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Issue date Jun 20, 1989
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Hitachi, Ltd.
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Masahisa Sobue
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...