Patent 7902492 was granted and assigned to Murata Machinery on March, 2011 by the United States Patent and Trademark Office.
A casing is capable of being transported by a transportation apparatus in an automated warehouse and being placed in a cell of the automated warehouse. A plurality of strings are suspended in the casing, and displacement of the strings caused by the air flow in the casing is measured to determine the state of the air flow based on the measured displacement.