top-and-bottom float
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Top-bar hive — Top bar hives are a style of beehive used for beekeeping. They are especially useful in areas where resources are limited, but are also increasingly popular among hobby beekeepers in industrialized nations. This article is primarily concerned… … Wikipedia
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Tap and die — Not to be confused with Tool and die. Taps and dies are cutting tools used to create screw threads, which is called threading. A tap is used to cut the female portion of the mating pair (e.g., a nut). A die is used to cut the male portion of the… … Wikipedia
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separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… … Universalium
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pole float — a very small and sensitive float with a thin tip, balsa wood body, a thin wire stem and about 15 20 cm long. Body up floats have a wider bulge at the top of the flat body, body down bulge at the bottom, slims have very long and thin bodies,… … Dictionary of ichthyology
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