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The Vanderbilt Automatic Submachine Gun (also known as the "Billy Gun" or the "Imperial typewriter") is a blowback-operated, selective-fire submachine gun, invented by Ilmarian Imperium (Nation)'s Vanderbilt Merchantile Company in early 1910.

There are two known models. "Model 1" was the first and had a stick magazine that took thirty rounds and a simple wooden foregrip. "Model 2" was more renown as the "Imperial Typewriter" and was in use more by criminal gangs. The Model 2 had a hundred round drum magazine and a better foregrip.