GARRETT, Presiding Judge.
This case comes before us for review by an appeal from the decision of the Board of Interference Examiners of the United States Patent Office (hereinafter referred to as the board) awarding priority to White and Graham (hereinafter usually referred to as appellee) as joint inventors of a valve structure stated to be for use principally upon slush pumps of large size handling the rotary mud which is employed in oil well drilling.
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