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Helmet shell

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
(Zool.) one of many species of tropical marine univalve shells belonging to Cassis and allied genera. Many of them are large and handsome; several are used for cutting as cameos, and hence are called cameo shells. See King conch.

See also: Helmet



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Carbon fiber helmets are lighter and their shells are more durable than other helmets for carbon fiber helmets often make use of a combination of Kevlar and carbon fibers and this combination produces helmet shells that are as strong as they would be if they were made out of metal.
Carbon Fiber Helmets by Tom Beaty / Automotive community
Nearby is a colony of fascinating dancing garden eels and big horned helmet shells.
Oahu Scuba Diving Vacations by Chris Chew / Travel, recreation and leisure community
uk CAPTION(S): HELMET SHELL Light shell offers comfort and maximum protection; INNER LINING Suspension to protect the head during acceleration; EAR GUARDS Anti-noise device blocks out drone at 1,500mph; X-RAY VISOR Infra-red images will let him see through fuselage; RADIO For contact with ground control and other pilots; OXYGEN MASK To help air intake amid huge G-force pressures; FLY PAST: Wartime goggles
THE X-RAY RAF; Helmet can see through planes by The Mirror (London, England)
 
 
 
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