Word: helical
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...fifth Rockefeller enterprise, Helicóptero Comercial, S.A., was formed only last week. Its aim: to contract with São Paulo coffee growers to spray their plantations against the deadly broca borer. Rockefeller's technicians found out that ordinary aerial spraying was missing the bugs, but that helicopters, hovering just over the trees and beating the chemical dust right down to the ground, could get them every time...
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