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In conclusion, the development and continual enhancement of rock drill extension rods epitomize the relentless pursuit of efficiency and innovation in the construction and mining sectors. These rods stand as testament to human ingenuity in conquering natural challenges and paving the way for more ambitious projects. As we look to the future, it's exciting to envision how these essential tools will adapt and contribute to the ever-evolving landscape of heavy-duty drilling operations.

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To begin the drilling process, it is important to first assess the condition of the limestone. This includes determining its thickness, density, and any potential weaknesses or fractures. Once these factors have been evaluated, a suitable drill bit must be selected. For limestone, diamond-tipped drill bits are typically the most effective option as they can withstand the high temperatures and pressures generated during drilling.

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