testing mineral造句

Lee deForest hired Greenleaf Whittier Pickard, who had served as an expert witness for him in patent cases, and who had himself been testing mineral radio wave detectors, to improve the carborundum detector.
Elements make minerals and minerals make rocks so actually testing minerals in the lab and in the field is essential to understand the history of the rock which aids data, zonation, metamorphic history, processes involved and other minerals.
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