Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hsien-Chung Tuan-Mu0
David Ling0
Date of Patent
March 9, 2010
Patent Application Number
12045492
Date Filed
March 10, 2008
Patent Primary Examiner
Patent abstract
A spanner comprises a box end that has an inner periphery consisting of a number of wall faces to define a first polygonal receiving space. Each wall face includes a groove defined therein. The grooves of the wall faces together define a second polygonal receiving space. At least one of the grooves includes a closed first end and an open second end.
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