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3030 / 5050/ 7070 series borosilicate high temperature Glass Lenses narrow beam anlge 4 /5 / 10 / 20 degree
3030 / 5050/ 7070 series borosilicate high temperature Glass Lenses narrow beam anlge 4 degree /5 degree / 10 degree / 20 degree
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FAX：86-21-51339921
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