What does Sgl Ref-B-H Clr 6mm window stand for? [closed]

What does Ref-B-H in "Sgl Ref-B-H Clr 6mm window" on BCL stand for?

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Closed for the following reason "duplicate question" by Julien Marrec 2018-02-13 02:28:12 -0500

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You can ask about Sgl Ref B and Ref A in the same question, closing this one

Julien Marrec (2018-02-13 02:28:08 -0500) edit