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GDD makes, sells, rents Transmitters, Receivers, Magnetic Susceptibility / Conductivity Detectors and related Geophysical and Survey Instruments The instrument was manufactured inbut has only been used twiceonce when the last customer received training and then again when Geomatrix tested the system.
Portland cement is the most common type of cement in general usage. It is a basic ingredient of concrete, mortar and many masonry worker Joseph Aspdin patented Portland cement in 1824. It was named because of the similarity of its colour to Portland limestone, quarried from the English Isle of Portland and used extensively in .