GILBERT, Circuit Judge (after stating the facts as above).
In the prior art were shown numerous patents involving the use of compressed air for conveying through pipes a wide variety of materials, such as concrete, crude oil, dredge spoil, sand, and water, grain, molten sulphur, etc. As to all prior patents the appellant insists that none is anticipatory of its combination, for that they all lack the salient feature thereof, the arch-breaking nozzle, or anything that...
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