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ia800907.us.archive.org The cartridge case could thus be made of a more substantial material which would act as a gas seal for much higher pressures than could be obtained with rimfire ammunition. Once again the precise date for the invention of the first centre fire weapon is difficult to ascertain, although there is a patent issued in 1861 for a Daws centre fire system (Figure 1.9). Probably no invention connected 18mm gas chromatography vials with round bottom Amazon chromatography vials...