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The National Drilling Association is a nonprofit trade association of contractors, manufacturers and  affiliated members from the drilling industry representing the geotechnical, environmental and mineral exploration sectors of this industry. The NDA mission is to promote the use of professional drilling contractors and their methods. Founded in 1972, NDA has more than 200 member companies, some of which are international. View History

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Our office is open for employees only. No visitors are allowed at this time in accordance with the Ohio Governor's orders.

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