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METHOD OF MAKING MOULDS AND CORES OF GYPSUM BASED MOULDING COMPOUND FOR PRESSURELESS CASTING LOW MELTING ALLOY WITH HIGHLY ACCURATE REPRODUCIBILITY OF SURFACE CONFIGURATION
METHOD OF MAKING MOULDS AND CORES OF GYPSUM BASED MOULDING COMPOUND FOR PRESSURELESS CASTING LOW MELTING ALLOY WITH HIGHLY ACCURATE REPRODUCIBILITY OF SURFACE CONFIGURATION