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Magnesium sulfate heptahydrate is an important chemical compound with a wide range of applications in various fields. Commonly known as Epsom salt, this compound is a popular ingredient in bath salts
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U screw conveyor is a special type of conveyor that can convey bulk material from any position (horizontal, or at an incline) to other position, u screw conveyor is one of reliable methods of
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Nov 05, 2015 · Calendars (early) Calendars (by L. E. Doggett, from P. Kenneth Seidelmann (ed.) Explanatory Supplement to the Astronomical Almanac (University Science Books, Sausalito)) ...