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13 декабря 2011 г.
67 стр. American Petroleum Institute, Second Edition, December, 1997 This specification is formulated to provide for the availability of safe and functionally interchangeable drill through equipment utilized for drilling for oil and gas. Technical content provides requirements for performance, design, materials, tests and inspection, welding, marking, handling, storing, and shipping. This specification does not apply to field use or field testing...