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1992-03-26
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1989-02-16
Preparation of foundry moulds and cores
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1995-06-15
Method of making ceramic cores for use in casting
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1993-03-17
Method and apparatus for manufacturing foundry cores
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1991-09-30
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1992-10-28
Method for producing foundry cores and moulds
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1992-01-27
Method of obtaining self-hardening moulding and core sand mixes
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1987-09-30
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1991-08-26
Self-hardening moulding and core sand mix
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1990-04-30
Method of utilizing used moulding and core sand mixes
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1991-09-23
Self-hardening and thermally hardenable moulding and core sand mix
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1990-04-17
Self-hardenable moulding or core sand mixes
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1991-12-17
Foundry self-hardening sand and core mixture
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1984-12-17
Self-hardening sand mix for making moulds and cores
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1993-05-26
Method of manufacturing core and mold
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1996-06-10
Method of obtaining coated sands for moulding and core sand mixes
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1990-04-30
Method of neutralizing and utilizing used moulding and core sand mixes
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1992-03-23
Self-hardening moulding and core sand
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1992-01-27
Binder for moulding and core sand mixes
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1983-05-09
Method of preparing moulding and core sand mix
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1990-05-28
Binder for moulding and core sand mixes
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1990-03-19
Self-hardening core or moulding sand mix
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1989-09-04
Method of hardening resins used as binder for mould and core sand mixes
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1987-06-15
Moulding or core sand mix and method of setting it