Composition of the light oils from low-t
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R.L. Brown; R.B. Cooper
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Article
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1926
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Elsevier Science
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English
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Nov., I926.] U.S. BUREAU OF MINES NOTES. 669 methods. Besides the circular saw, a modified type of gang saw has been developed, and is in successful use in several slate mills. Other labor-saving devices include an air-driven slate splitter, power-driven punching machines, and trimming machines for