THE BONTA GLASS ROLLING MACHINE GLASS GRINDING AND POLISHING MACHINE AND ANNEALING OVEN. J. W. BONTA'S ANNEALING OVEN FOR PLATE GLASS. Coal Consumed in Cities of the United States. 105 Years Old., scientific american, 1893-12-30
THE BONTA GLASS ROLLING MACHINE GLASS GRINDING AND POLISHING MACHINE AND ANNEALING OVEN. J. W. BONTA'S ANNEALING OVEN FOR PLATE GLASS. Coal Consumed in Cities of the United States. 105 Years Old., scientific american, 1893-12-30
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