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Dental prosthesis
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Patent number 5,346,396
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Issue date Sep 13, 1994
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Olympus Optical Co., Ltd.
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Yasuharu Hakamatsuka
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Method of preparing calcium phosphate
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Patent number 5,322,675
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Issue date Jun 21, 1994
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Director General of Agency of Industrial Science and Technology
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Yasuharu Hakamatsuka
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Drug-impregnated ceramic
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Patent number 5,318,779
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Issue date Jun 7, 1994
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Olympus Optical Co., Ltd.
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Yasuharu Hakamatsuka
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Mold for the casting of glass ceramic
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Patent number 5,013,363
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Issue date May 7, 1991
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Olympus Optical Co., Ltd.
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Yasuharu Hakamatsuka
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Dental crown material
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Patent number 4,747,876
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Issue date May 31, 1988
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Olympus Optical Co., Ltd.
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Yasuharu Hakamatsuka
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Artificial tooth root
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Patent number 4,713,006
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Issue date Dec 15, 1987
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Olympus Optical Co., Ltd.
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Yasuharu Hakamatsuka
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE