Neutral filter, light quantity adjustment apparatus, image pickup apparatus, manfacturing method of neutral filter, and die-cutting forming apparatus neutral filter
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United States of America Patent
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Issued Date -
Apr 22, 2010
app pub date -
Sep 17, 2009
filing date -
Oct 21, 2008
priority date (Note) -
Abandoned
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Abstract
and the alignment reference faces are concurrently formed in beforehand set distance positions from the density boundary line by the press forming.
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