Henry Goodman of St Louis, Missouri, had a few patents for doiuble barrel guns. Patent No. 212459 for a hammer gun was granted on Feb. 18, 1879. Patent No. 267,876 for a Concealed Hammer Gun was granted Nov. 21, 1882.
Found another. Patent No. 185,912 granted Jan. 2, 1877, looks like it may well be related to the gun in question.
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