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John Adolphus Bernard Dahlgren (1809-1870) served as Chief of the Bureau of Ordnance from 1862-1863 and 1868–1869. He preceded and later succeeded Henry Augustus Wise (1819-1869) who held the office from 1863-1868. (Wise wrote under the pen name 'Harry Gringo').Who was Chief of the Bureau of Ordnance before and after Harry Gringo?
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