Series G12 Glass Discs and Rectangles On John C. Ernst Co. Inc.

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Series G12 Annealed Borosilicate Glass Disc

Series G12 Glass, Furnace Glass, Quartz Glass, and Annealed Borosilicate Discs

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Series G12 Annealed Borosilicate and Tempered Glass Rectangle

Series G12 Glass, Furnace Glass, Quartz Glass, and Annealed Borosilicate Rectangles

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