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elecrtic arc furnace induction furnace direct fired furnace cupola furnace pattern allowances problems making of pattern allowances in patterns pattern materials types of pattern patterns in casting carbon boron carbide fibers silicon carbide boron kevlar silica glass fibers reinforcements properties of glass classification of polymers copolymer homo polymer synthetic polymers natural polymers elastomers thermoplastics thermosets polymers ceramics and application ceramic materials ceramics studies inter-metallics planning slotting shaping lathe arc welding gas welding assembly methods liquid & ultrasonic tests worm and worm wheel forces to the foundation thin plates