But in the Colt Deringers the solid-frame spur-triger design was still present in the patent when Colt's purchased the National Arms Company in 1870.
Short (a round it introduced in 1863), and Daniel Moore and David Williamson's Pocket Revolver using the Caliber .32 Teat-fire cartridge (which it made under both the Moore and National Arms marques).
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Colt continued to produce the .41 rimfire derringer after the acquisition as an effort to break into the metallic cartridge gun market.
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National Arms produced about 30,000 of the Caliber .32 Teat-fire revolvers from 1864 to 1870, when it was acquired by Colt's Manufacturing Company.
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The Teat-fire cartridge was a .32 caliber pistol cartridge designed by Daniel Moore and manufactured by Moore and his partner David Williamson for their Pocket Revolver, was produced under both the Moore and National Arms marques by the National Arms Company of Brooklyn, New York in the mid-19th century.