PER CURIAM:
Plaintiffs appeal from a summary judgment dismissing their patent infringement suit on the grounds that claims one and four of their Patent No. 3,175,330 were obvious as a matter of law and hence invalid.
This court has often cautioned that relatively rare is the suit in which summary judgment is warranted; and the observation is especially relevant to litigation involving patentability of a mechanical device. Northrop Architectural Systems, a...
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