L. HAND, Circuit Judge.
The defendant appeals from the usual judgment of injunction and for an accounting, in an action for the infringement of patent No. 1,982,406, issued on November 27, 1934 to Hans F. Tönnies. Infringement being conceded, the sole question that we shall consider is the validity of the claims. The patent is for "an exposure meter which directly indicates the time of exposure necessary for taking photographs" (page one, lines 5, 6). It operates...
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