RICH, Judge.
This appeal is from the decision of the Patent and Trademark Office (PTO) Board of Appeals (board) affirming the rejection of claims 1-5 in appellants' application serial No. 452,050, filed March 18, 1974, for "Sub-Critical Time Modulated Control Mechanism," under 35 USC 103 as obvious from U. S. Patent No. 3,430,536 for "Time Modulated Pneumatically Actuated Control
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