Smith-Petersen nail — Smith Pe·ter·sen nail smith pēt ər sən n a flanged metal nail used to fix the femoral head in fractures of the neck of the femur Smith Petersen Marius Nygaard (1886 1953) American orthopedic surgeon. Smith Petersen practiced orthopedic surgery in … Medical dictionary
Marius Nygaard Smith-Petersen — Born 1886 (1886) Grimstad Died 1953 (1954) … Wikipedia
Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations … Wikipedia
Timeline of Russian inventions and technology records — The Hall of Space Technology in the Tsiolkovsky State Museum of the History of Cosmonautics, Kaluga, Russia. The exhibition includes the models and replicas of the following Russian inventions: the first satellite, Sputnik 1 (a ball under the… … Wikipedia
Rail fastening system — Elements of a baseplate based rail fastening system 1. Screw for fixing plate to sleeper 2. Elastomeric pad supporting rail 3. Tension washer 4. Rail clamp 5. Tensioning bolt (nut not shown) 6. Baseplate … Wikipedia
Rail tracks — are used on railways (or railroads), which, together with railroad switches (or points), guide trains without the need for steering. Tracks consist of two parallel steel rails, which are laid upon sleepers (or cross ties) that are embedded in… … Wikipedia