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Transactions . Combination of Two Conical Poles, ofSemi-angle ° and 45° Respec-tively. Pole-distance, 2 in. Fig. 9. Fig. 10 Combination of a Conical Pole of Semi-angle ° and a Half-inch SphericalPole. Pole-distance, 2 in.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries