RICH, Judge.
This appeal is from the decision of the Patent Office Board of Appeals affirming the rejection of claims 36-44 of appellant's patent application, Ser. No. 507,270, filed May 10, 1955, for "Heat Treating Tray."
The sole issue is patentability over the following references:
Menough 2,601,980 July 1, 1952; Feltes 1,750,039 Mar. 11, 1930; Shelden 1,768,157 June 24, 1930; Swiss Patent 128,684 Nov. 16, 1928.
The nature of the invention...
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