Who made a 12 gauge shotgun under the tradname American Nitro?

Answer 1

American Nitro: Trade name used by H. & D. Folsom Arms Co. on shotguns.

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Answer 2

The 12 gauge shotgun under the tradename American Nitro was made by the Iver Johnson Arms and Cycle Works company. They produced firearms under various trade names, including American Nitro, in the early 1900s.