TONE, Circuit Judge.
The patent before us in this infringement suit covers a bar and appurtenant hardware to be used in mounting sirens and flashing lights on the tops of police cars and emergency vehicles. The District Court held the claims relied on valid and infringed. We hold them invalid for obviousness and therefore do not reach the issue of infringement.
I
Only claims 3 and 4 of plaintiff's U.S. Patent No. 3,677,451 are in issue. The patent...
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