BLAND, Associate Judge.
Appellants have appealed here from the decision of the Board of Appeals of the United States Patent Office, affirming the examiner's action in rejecting all the claims in appellants' application relating to new and useful improvements in flash back arrestors. In this court, the appeal was dismissed as to all the claims except claims 10 and 15, which follow:
"10. A flash back arrester comprising a cartridge holder having an internal...
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