Automatic tapping thimble
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United States of America Patent
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-
Sep 19, 2000
Grant Date -
N/A
app pub date -
Oct 23, 1998
filing date -
Oct 31, 1997
priority date (Note) -
Expired
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Abstract
The invention relates to an automatically opening tapping thimble made from a refractory material for casting crucibles which are used in aluminothermic reactions. This thimble consists entirely or partially of air-permeable graphite or metal whose melting point lies between 2100 and 3727.degree. C.
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