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| CTU (CTU (coating thickness unit) is an optical unit which is frequently used in the glass industry for defining the thickness of coatings and is based on measurements of the reflection of incident light. HarleyQ) | |||
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| CTU (CTU (coating thickness unit) is an optical unit which is frequently used in the glass industry for defining the thickness of coatings and is based on measurements of the reflection of incident light. HarleyQ) | |||