Metallurgical Evaluation of Metal Pinion, Final Drive Gear Open PDF Document Details Document Type Technical Report Publication Date Jan 24, 1956 Accession Number AD0409934 Entities People John Vettraino Tags DTIC Thesaurus Topics Alloys Boron Drives Final Drives Government Procurement Governments Hardness Magnification Materials Materials Laboratories Microhardness Microstructure Munitions Procurement Steel Test And Evaluation