A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. Vol. 21. t j $3 per Annum. Improved Tunneling Drill. THE AMERIC AN DIAMOND DRILL COMPANY'S N 2 TUNNELING DRILL., scientific american, 1871-11-18
A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. Vol. 21. t j $3 per Annum. Improved Tunneling Drill. THE AMERIC AN DIAMOND DRILL COMPANY'S N 2 TUNNELING DRILL., scientific american, 1871-11-18
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