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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 ...
A typical milling machine of the era, built by Cincinnati Milling Machine Company. It is a horizontal, with an overarm for the arbor. The Cincinnati Milling Machine Company was an American machine tool builder headquartered in Cincinnati, Ohio.
Shown to the right is a "spinlock" dumbbell, whose ends are threaded to accept large nuts as collars. Alternatively, a dumbbell may have smooth ends with plates being secured by a sprung collar. Plate-loaded (adjustable) dumbbells (a.k.a. loadable dumbbells) Spin-lock; Spring collar clips; Compression ring collar; Ironmaster quick-lock
On January 29, 2004, about 420,000 BowFlex machines were recalled due to mechanical problems. In November 2004, there was a recall of nearly 800,000 (680,000 Power Pro units and 102,000 Ultimate units) BowFlex machines after reports that several models had broken unexpectedly.
[2] [3] Standard plates are usually paired with adjustable dumbbells and Olympic plates with full-size barbells, although standard barbells and Olympic dumbbells exist. [ 4 ] [ 5 ] Weight plates may incorporate holes for ease of carrying (called "grip plates") or be solid discs (especially those used for competition).
Mikron IIIB Improved version of the Mikron IIIA 56 kW (75 hp) at 2,750rpm for 5 minutes, max continuous power of 51 kW (69 hp) from 2.44 L (148.90 cu in), compression ratio 7.2:1, bore 90 mm (3.54 in), stroke 96 mm (3.78 in), dry weight 69 kg (152.12 lb) Almost identical with IIIA except the compression ratio.