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High hardness composite sintered compact
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Patent number 4,837,089
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Issue date Jun 6, 1989
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Nippon Oil and Fats Company, Limited
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Masatada Araki
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3832273
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Patent number 3,832,273
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Issue date Aug 27, 1974
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3730827
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Patent number 3,730,827
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Issue date May 1, 1973
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B22 - CASTING POWDER METALLURGY