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Attenuated hepatitis A virus
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Patent number 5,021,348
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Issue date Jun 4, 1991
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Merck & Co., Inc.
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Paula A. Giesa
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Hepatitis A antigen
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Patent number 4,031,203
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Issue date Jun 21, 1977
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Merck & Co., Inc.
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Philip J. Provost
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Hepatitis A antigen
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Patent number 4,029,764
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Issue date Jun 14, 1977
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Merck & Co., Inc.
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Philip J. Provost
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G01 - MEASURING TESTING
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Hepatitis A antigen
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Patent number 4,017,601
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Issue date Apr 12, 1977
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Merck & Co., Inc.
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Maurice R. Hilleman
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE