HATFIELD, Associate Judge.
This is an appeal in an interference proceeding from the decision of the Board of Appeals, affirming the decision of the Examiner of Interferences, awarding priority of invention to Harold D. Arnold:
The alleged invention relates to certain structural improvements in vacuum tubes or audions. The count in issue reads as follows:
"An electron discharge device comprising a stem, cathode, anode and grid electrodes having their...
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