GRAHAM, Presiding Judge.
The appellants filed their application in the United States Patent Office for a patent on certain improvements in "gas-filled incandescent cathode discharge tubes." Both tribunals in the Patent Office rejected claims 13, 14, 15, 16, and 19 of the application, and the applicants have appealed. The rejection was made upon the following references:
Kruh, 1,032,914, July 16, 1912,
Birdsall 1,291,379, January 14, 1919,
George...
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