GARRETT, Associate Judge.
Appellant's claims in this case relate to improvements in back-flash arresters. They are seven in number and all were successively rejected by the examiner and by the Board of Appeals of the Patent Office. Appeal was then taken to this court.
It will be sufficient to quote Nos. 1, 3, and 7:
"1. A flash arrester comprising a casing adapted to be coupled in a gas supply line and containing a replaceable cartridge comprising...
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