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Let's try to find a major prior art of US6990xxx(A) via PatentMagnet.
The technology introduced from the 'mouse trap' patent
is being seriously challenged by a 'bird cage' patent as illustrated in the drawings.
Unless search relates bird and mouse in searching, this type of seemingly 'foreign' prior arts
can easily remain hidden.
PatentMagnet uncovers prior arts without being constrained by keywords
or technology bias as long as the essence of what searchers are looking for exists.
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True Story Example
