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Laser marking system
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Patent number 5,157,235
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Issue date Oct 20, 1992
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Hitachi, Ltd.
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Kiyoshi Okumura
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Gas laser device
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Patent number 4,740,980
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Issue date Apr 26, 1988
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Hitachi, Ltd.
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Toshiharu Shirakura
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H01 - BASIC ELECTRIC ELEMENTS
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Photocoupling device
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Patent number 4,354,115
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Issue date Oct 12, 1982
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Hitachi, Ltd.
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Terunori Warabisako
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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