welding practices
41Tetrachloroethylene — IUPAC name …
42Mask — For other uses, see Mask (disambiguation). This stone mask from the pre ceramic neolithic period dates to 7000 BCE and is probably the oldest mask in the world (Musée de la Bible et de la Terre Sainte) …
43Professional diving — Hardhat diving redirects here. Often, hardhat diving is used to specifically mean diving in the old type Standard diving dress. A US Navy diver at work. The umbilical supplying air from the surface is clearly visible Professional diving is a type …
44Shelf life — This pack of diced pork says display until 7 May and use by 8 May …
45American Society of Mechanical Engineers — The American Society of Mechanical Engineers (ASME) is a professional body, specifically an engineering society, focused on mechanical engineering. The ASME was founded in 1880 by Alexander Lyman Holley, Henry Rossiter Worthington, John Edison… …
46Barrel — For other uses, see Barrel (disambiguation). For the use of oak aging barrels in wine, see Oak (wine). Traditional oak barrels in Chile …
47Coppersmith — For other uses, see Coppersmith (disambiguation). Workshop of a coppersmith. The oldest units are from the period around 1850. A coppersmith, also known as a redsmith, is a person who makes artifacts from copper. The term redsmith …
48Hydroforming — (or hydramolding) is a cost effective way of shaping malleable metals such as aluminum or brass into lightweight, structurally stiff and strong pieces. One of the largest applications of hydroforming is the automotive industry, which makes use of …
49SR West Country and Battle of Britain Classes — Infobox Locomotive powertype=Steam name = SR Un rebuilt West Country/Battle of Britain Classes Herring, pp. 160 ndash;161] caption = Un rebuilt West Country Class 21C123 Blackmoor Vale , as preserved, in Southern Railway Malachite Green and… …
50SR Merchant Navy Class — Infobox Locomotive powertype=Steam name = SR Merchant Navy ClassHarvey] caption = Official Southern Railway photograph of 21C1 Channel Packet as built, 1941. designer = Oliver Bulleid builder = SR Eastleigh Works builddate = 1941 ndash;1949… …
