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Typically, a bicep curl begins with the arm fully extended with a supinated (palms facing up) grip on a weight. A full repetition consists of bending or "curling" the elbow until it is fully flexed, then slowly lowering the weight to the starting position. The torso should remain upright instead of swinging back and forth, as doing so transfers ...
The EMD Model 40 was a two-axle diesel-electric switcher locomotive built by Electro-Motive Corporation (EMC), and its corporate successor, General Motors ' Electro-Motive Division (EMD) between August 1940 and April 1943. Nicknamed "critters", eleven examples of this locomotive were built. Powered by twin General Motors Detroit Diesel 6-71 ...
A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical tool that combines a hammer directly with a chisel. It was invented by William McReavy, who then sold the patent to Charles Brady King. [ 1 ] Hand-held jackhammers are generally powered by compressed air, but some are also powered by ...
A Schmidt hammer, [1] also known as a Swiss hammer or a rebound hammer or concrete hammer test, is a device to measure the elastic properties or strength of concrete or rock, mainly surface hardness and penetration resistance. It was invented by Ernst Heinrich Wilhelm Schmidt, a Swiss engineer. [2] The hammer measures the rebound of a spring ...
The Smith & Wesson Safety Hammerless or Smith & Wesson New Departure (nicknamed by collectors as the Lemon Squeezer) is a double-action revolver that was produced from 1887 to 1940 by Smith & Wesson. Based on the Smith & Wesson Model 2 double-action design, the revolver incorporated an internal hammer and an external grip safety on its back-strap.
Ball-peen hammer. A ball-peen or ball pein hammer, also known as a machinist's hammer, [1] is a type of peening hammer used in metalworking. It has two heads, one flat and the other, called the peen, rounded. It is distinguished from a cross-peen hammer, diagonal-peen hammer, point-peen hammer, or chisel-peen hammer by having a hemispherical peen.
Pancor Jackhammer. The Pancor Corporation Jackhammer is a 12-gauge, blow-forward gas-operated bullpup automatic shotgun designed in 1984 and patented in 1987. Only three working prototypes of the Jackhammer were built. Nonetheless, its distinctive aesthetics and futuristic design have made it popular as a weapon in many video games, notably ...
MIL-S-901. Military Specification MIL-S-901D[1] is for high-impact mechanical shock which applies to equipment mounted on ships. Its publication date was Mar 17, 1989. Two levels apply: Grade A items are items which are essential to the safety and continued combat capability of the ship; Grade B items are items whose operation is not essential ...
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