conical-nosed screw

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chondrichthian — /kon drik thee euhn/, n. any member of the class Chondrichthyes, comprising the cartilaginous fishes. [ < NL, equiv. to chondr CHONDR + Gk ichthýes (pl.) fish] * * * ▪ fish class Introduction class name Chondrichthyes, or Selachii any… … Universalium
British military rifles — The origins of the modern British military rifles are within its predecessor the Brown Bess musket. While a musket was largely inaccurate due to a lack of rifling and generous tolerance to allow for muzzle loading it was cheaper to produce,… … Wikipedia
Rifle — A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves ( rifling ) cut into the barrel walls. The raised areas of the rifling are called lands, which make contact with the… … Wikipedia

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