Etymology
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Instamatic 
1962, proprietary name (reg. Eastman Kodak Co., Rochester, New York) for a type of self-loading camera, from instant + automatic.
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Luger (n.)
type of German automatic pistol, 1904, from the surname of Georg Luger (1849-1923), Austrian-born firearms expert.
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Toyota 
Japanese automaker, begun 1930s as a division of Toyoda Automatic Loom Works, named for the family name of the founder. There seems to be no one accepted explanation for the change from -d- to -t-.
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Parabellum (n.)

proprietary name for a type of automatic firearm, 1904 (Mauser & Deutsche Waffen und Munitionsfabriken), from Latin phrase si vis pacem, para bellum, from para, imperative of parare "to prepare" (from PIE root *pere- (1) "to produce, procure") + bellum "war" (see bellicose).

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