Permanent mold with core pulling device
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United States of America Patent
Stats
-
Jul 31, 1984
Grant Date -
N/A
app pub date -
Mar 5, 1981
filing date -
Jul 5, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A permanent mold is equipped with a core pulling device covered with a thin sand jacket, that can be peeled off, in order to produce unregular caves in the cast.
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Cited Art Landscape
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