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Elevator control system
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Patent number 5,042,620
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Issue date Aug 27, 1991
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Hitachi, Ltd.
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Kenzi Yoneda
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B66 - HOISTING LIFTING HAULING
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Information service system
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Patent number 4,984,174
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Issue date Jan 8, 1991
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Hitachi, Ltd.
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Seiji Yasunobu
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G06 - COMPUTING CALCULATING COUNTING
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Crane control method
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Patent number 4,756,432
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Issue date Jul 12, 1988
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Hitachi, Ltd.
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Haruhito Kawashima
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B66 - HOISTING LIFTING HAULING
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Crane control method
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Patent number 4,717,029
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Issue date Jan 5, 1988
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Hitachi, Ltd.
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Seiji Yasunobu
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B66 - HOISTING LIFTING HAULING
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