Reinforcing structure for metal shell and manufacturing method for metal shell
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United States of America Patent
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Feb 24, 2009
Grant Date -
Jan 29, 2009
app pub date -
Nov 12, 2007
filing date -
Jul 24, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A metal shell is composed of a trunk portion and a pair of reinforcing portions provided at opening ends of the trunk portion. The trunk portion is formed of a metallic cylinder, the reinforcing portion is formed of a metallic ring having the same diameter as that of the cylinder, and the ring is joined to at least an opening end of the cylinder.
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