File:Glass production, glass-blowing, scale, laboratory, glass technician, Bunsen burner Fortepan 62566.jpg
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![File:Glass production, glass-blowing, scale, laboratory, glass technician, Bunsen burner Fortepan 62566.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Glass_production%2C_glass-blowing%2C_scale%2C_laboratory%2C_glass_technician%2C_Bunsen_burner_Fortepan_62566.jpg/735px-Glass_production%2C_glass-blowing%2C_scale%2C_laboratory%2C_glass_technician%2C_Bunsen_burner_Fortepan_62566.jpg?20160814223146)
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