...Livingstone (1871) passed thirty smelting houses inone journey, and Cameron came across bellows with valves, andtribes who used knives in eating... 
W.E.B. Du Bois 「The Negro」
...In the interval between the contractions these valves hangdown into the ventricles...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Bivalve -ed: applied to mouth parts consisting of twoparts or valves united to form a tube...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Corniculi: the little horny tips or pieces of theovipositor in Orthoptera; see valves...
John. B. Smith 「Explanation of Terms Used in Entomology」
...14, for it is seenthat in each case the figure showing the two opened valves has abipartite extended foot, whereas that of the single valve is simple...
Alfred M. Tozzer and Glover M. Allen 「Animal Figures in the Maya Codices」
...The centre of movementfor the circulation of the fluids is the heart, a strong muscular sac, whichcontracts regularly and is equipped with valves like a pump...
Ernst Haeckel 「The Evolution of Man」
...In this vessel are valves,accurately fitting over the upper vents of the pipes, which stop up theventholes, and keep what has been forced by pressure into the vesselfrom going down again...
Vitruvius 「Ten Books on Architecture」
...The three adjusted gas masks and thrust the mouths of two gas cylinderswhich were on the light truck into the crack, and opened the valves...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...Some of these instruments—mostof them, in fact—must be valves...
Various 「Astounding Stories, July, 1931」
..."We'll know soon!" was the grim answer, as Prescott worked franticallynow with his valves and levers...
Various 「Astounding Stories, July, 1931」
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befitting asteroids originate
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