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Barbells and dumbbells had been used for strength training for many years, especially by weightlifters and bodybuilders. However, inexperienced users could injure themselves with these "free weights". In the late 1940s and early 1950s, Zinkin operated several gyms in the Los Angeles area. Zinkin wanted to make strength training safer and more ...
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The weight used is selected by inserting a pin in the stack that causes each plate above the pin to be pulled by the cable. This arrangement is known as a "selectorized" weight machine. [35] Some weight machines, such as the sled-type leg press, or the Smith machine, are designed to be loaded with Olympic plates instead of using a cable-driven ...
The Muncie SM420 is a heavy duty, four-speed manual transmission that was produced from 1947 to 1967 by General Motors for civilian use in a variety of pickup trucks, buses, dump trucks and heavy equipment.
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