FASTENING SECTION STRUCTURE
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United States of America Patent
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Issued Date -
Nov 19, 2015
app pub date -
Dec 17, 2013
filing date -
Dec 18, 2012
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Abstract
A fastening section structure having a plurality of concentric circle-shaped rib walls around a fastening section of a member having the fastening section. The fastening section structure has a bearing strength in at least the second-layer rib wall that is lower than the bearing strength in the innermost-layer rib wall closest to a fastening member.
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