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Heat treatment by light irradiation
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Patent number 5,302,230
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Issue date Apr 12, 1994
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Ricoh Company, Ltd.
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Masumitsu Ino
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Contact type image sensor
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Patent number 5,027,226
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Issue date Jun 25, 1991
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Ricoh Company, Ltd.
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Takehito Nagata
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Force detecting device
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Patent number 4,849,730
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Issue date Jul 18, 1989
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Ricoh Company, Ltd.
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Kouji Izumi
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G01 - MEASURING TESTING