Glass industry uses a standard method of designating the surfaces of flat glass products, as 1, 2, 3, and so on. Does the numbering of surface designation begin from the outside surface or inside surface of a glass product?

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The Answer of Glass industry uses a standard method of designating the surfaces of flat glass products, as 1, 2, 3, and so on. Does the numbering of surface designation begin from the outside surface or inside surface of a glass product?

Glass Industry Uses a Standard Method of Designating the Surfaces