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Hello! I'm a chat assistant and I've reviewed the operating instructions for the Hilti DD 200 core drill. I am familiar with the safety guidelines related to the use of damaged bits and the instructions on when to replace core drill bits when the cutting rate falls, and other instructions provided. I'm ready to answer your questions about the DD 200.
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What should I do before each use of the core drill?
What should I do if the drilling rate decreases significantly?
What should I do if I have any questions regarding warranty?