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Introductions By Marcia Gruver   Coring additions The DD 350 and DD 500 coring systems from Hilti come with water-cooled, high-frequency motors, rated at 3,600 watts in the DD 350 and 5,500 watts in the DD 500. This 1,000-hertz, high-frequency brushless technology reduces weight and cuts maintenance costs. Equipped with 10-speed electronic gearing, […]
March 1, 2010
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