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METHOD OF MAKING MOULDS AND PATTERNS OF GYPSUM BASED MOULDING SAND MIX FOR PRESSURELESS CASTING OF LOW-MELTING METAL ALLOYS CAPABLE OF REPRODUCING MOULD CAVITY SURFACE CONFIGURATION WITH VERY HIGH ACCURACY
METHOD OF MAKING MOULDS AND PATTERNS OF GYPSUM BASED MOULDING SAND MIX FOR PRESSURELESS CASTING OF LOW-MELTING METAL ALLOYS CAPABLE OF REPRODUCING MOULD CAVITY SURFACE CONFIGURATION WITH VERY HIGH ACCURACY
