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3925577
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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3802967
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H01 - BASIC ELECTRIC ELEMENTS
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3713900
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Issue date Jan 30, 1973
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C30 - CRYSTAL GROWTH
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3668555
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3585087
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Issue date Jun 15, 1971
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3438810
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H01 - BASIC ELECTRIC ELEMENTS
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C30 - CRYSTAL GROWTH