SMITH, District Judge.
Plaintiff, owner of the Woodfine patent No. 1,916,905 for an improvement in means of setting margins on typewriters, brings this action against defendant, claiming that a device labelled by defendant its "Keyboard Margin Control" infringes three claims of the Woodfine patent, which are as follows:
"Claim 1. In margin regulator mechanism the combination with a typewriter including a movable carriage and a fixed stop post, of a rack bar...
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