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United States of America Patent
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Jan 12, 2021
Grant Date -
N/A
app pub date -
Mar 15, 2018
filing date -
Mar 24, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A relationship of 0<α1<2θ1 is satisfied, where α1 is an angle formed between a first line which is vertical to a parallel line passing through a pivot center point and being parallel to a pivot extending direction, passes through a center point of a first portion from the center point of the first portion toward the parallel line, and a second line which is vertical, at the center point of the first portion, to a first portion extending direction, passes through the center point of the first portion toward a vertical line being vertical to the parallel line and passing through the pivot center point, and where θ1 is an angle formed between the first line and a third line connecting the pivot center point and the center point of the first portion from the center point of the first portion toward the pivot center point.
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