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Cushion
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Patent number 4,944,992
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Issue date Jul 31, 1990
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NHK Spring Co., Ltd.
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Yasuo Yoneshige
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B68 - SADDLERY UPHOLSTERY
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Leaf spring
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Patent number 4,546,958
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Issue date Oct 15, 1985
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NHK Spring Co., Ltd.
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Akira Ohno
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B60 - VEHICLES IN GENERAL
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Fiber-reinforced plastics leaf spring
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Patent number 4,530,490
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Issue date Jul 23, 1985
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NHK Spring Co., Ltd.
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Atsushi Misumi
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL