SOPER, Circuit Judge.
This case involves three patents relating to listing devices or visible index systems which are used in business offices and other institutions where it is important to have immediate access to information which otherwise would be accumulated in files. There are two patents to Powell in suit; No. 1,594,112, for an index strip sheet granted July 27, 1926, upon an application filed July 14, 1922, and No. 1,683,207, for an index strip, granted September...
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