SMITH, Judge.
Appellant seeks reversal of the decision of the Board of Appeals, which affirmed the examiner and held that claims 39-42, all of the claims in the case, are unpatentable over the prior art, and for the further reason that the application is barred by some twenty years of what the examiner and the board found to be prior public use.
The invention disclosed in the instant application, Serial Number 392,980, filed November 18, 1953, relates to improvements...
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