case-hardened steel
51Mississippi class battleship — USS Mississippi Class overview Name: Mississippi class battleship O …
52M16 rifle — Rifle, 5.56 mm, M16 From top to bottom: M16A1, M16A2, M4A1, M16A4 Type Assault rifle Place  …
537.92x57mm Mauser — Infobox Firearm Cartridge name=7.92x57mm caption= From left to right 9.3x62mm, .30 06 Springfield, 7.92x57mm IS, 6.5x55mm and 7.62x51 mm cartridges origin=flagcountry|German Empire type=Rifle service=1888 present used by=Germany and others… …
54Katana construction — was the labour intensive bladesmithing process developed in Japan for forging katana and other Japanese blades. Katana and wakizashi were often forged with different profiles, different blade thicknesses, and varying amounts of grind. Wakizashi… …
55Rockwell scale — The Rockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a… …
56Thiers Issard — or Thiers Issard Sabatier is a French cutlery manufacturer; they are one of a number of companies using the Sabatier name. It exports a wide range of knives and straight razors to approximately thirty countries.… …
57artillery — /ahr til euh ree/, n. 1. mounted projectile firing guns or missile launchers, mobile or stationary, light or heavy, as distinguished from small arms. 2. the troops or the branch of an army concerned with the use and service of such weapons. 3.… …
58Phonograph — Turntable redirects here. For other uses, see Turntable (disambiguation). Edison cylinder phonograph ca. 1899 …
59Sword making — Sword making, historically, has been the work of specialized smiths or metalworkers called bladesmiths or swordsmiths. Modern armorers and swordsmiths still ply their trade although to a more limited clientele. Their products are oriented toward… …
60Harvey armor — Harvey armour was a type of steel armour developed in the early 1890s in which the front surfaces of the plates were case hardened. The method for doing this was known as the Harvey process. This type of armor was used in the construction of… …
