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To expose larger numbers of animals, primarily dogs and monkeys, in a five-year long inhalation study of uranium dioxide (UO/sub 2/), four separate chambers of the hexagonal type were combined in such a way that a common air intake and dust feed system can be used. The new multiple unit is described in detail and such engineering aspects as chamber design, selection of exposure equipment, and operational characteristics are discussed. (C.H.)
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Leach et al. (1959) studied this question.
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