Boroscopic Examination of 75-mm Pack Howitzer M1A1E1, Centrifugal Castings Number 903 & 923, & Forging Number 1797, Document Details Document Type Technical Report Publication Date Sep 13, 1937 Accession Number ADA951619 Entities People N. L. Reed Tags DTIC Thesaurus Topics Artillery Casting (Fabrication) Castings Centrifugal Casting Fabrication Guns Howitzers Structural Components