Statistics for occurrence #1 of “D. M. Mefford” in entry cannon of Harper's Encyclopedia of United States History:

...ugh boring bronze guns and forcibly expanding the bore to its finished size by means of mandrels, 1869. Pneumatic dynamite torpedo-gun built and mounted at Fort Lafayette (founded on invention of D. M. Mefford , of Ohio), 1885. Congress makes an appropriation for the establishment of a plant for gunmaking at the Watervliet arsenal, West Troy, 1889. Manufacture of heavy ordnance begun at the Washing...
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D. M. Mefford 2 2 0 0 0 user votes

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