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The "Bell Helmet Company" was established as a division of Bell Auto Parts in 1956. [2] Bell introduced its Star model, the first full-face motorcycle helmet on the market, in 1968. [4] In 1971, Bell produced the first full-face off-road motorcycle helmet. [5] Bell made its first production helmet in 1954.
Helmets since the mid-20th century have often incorporated lightweight plastics and other synthetic materials, and their use has become highly specialized. Some important recent developments include the French SPECTRA helmet, Spanish MARTE helmet or the American PASGT (commonly called "Kevlar" by U.S. troops) and Advanced Combat Helmet, or ACH.
The French scale measures the outer diameter of the catheter, not the size of the internal drainage channel (inner diameter). For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel.
The first commercially successful purpose-designed bicycle helmet was the Bell Biker, a polystyrene-lined hard shell released in 1975. [3] [4] At the time there was no appropriate standard; the only applicable one, from Snell, would be passed only by a light open-face motorcycle helmet. Over time the design was refined and by 1983 Bell were ...
Sizing systems vary based on the country and the type of garment, such as dresses, tops, skirts, and trousers. There are three approaches: Body dimensions: The label states the range of body measurements for which the product was designed. [1] (For example: bike helmet label stating "head girth: 56–60 cm".)
Flying helmet – closely fitting solid helmet designed to resist impacts within the cockpit of military aircraft – colloquially known as a 'bone dome' Garrison cap, also campaign cap, wedge cap, flight cap, garrison hat, overseas cap, side cap, field service cap; Glengarry, also Glengarry bonnet, Glengarry cap; Hardee hat; Helmet; Jeep cap