227 resultados para Drilling and boring machinery.


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"October 1955."

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"January 1956."

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Radiometric logging of the drill holes was accomplished by means of a Geiger counter-type probe. Samples for chemical assay were selected after checking the core with a Geiger counter and correlation with the radiometric logging record. The exploration project did not disclose significant amounts of ore-grade material although encouraging indications were found at two different properties.

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Referred to the Committee on interstate and foreign commerce and ordered printed, with illustrations, June 6, 1938.

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Mode of access: Internet.