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Quart Glass River Sand Making Machine

Sep 05, 2019 A worker needed to sand and file a piece ever so precisely so that it would fit within a complicated framework. Before we knew how to make glass on our own, Stone Age humans made efficacious use of materials like obsidian, a naturally occurring volcanic glass.Still in use today, these handy little fragments are hard, yet brittle, so they can be easily fractured and manipulated into

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