(1870 Manufacturer and Builder Magazine)
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"the economical superiority of diamond drills over all others, even in rock drilling, however improbable at first sight, has now been perfectly established; and since the first application of the principle by M. Leschot, of Paris, France, in 1860, their use has extended over all the civilized world...."
(1870 Manufacturer and Builder Magazine)
(1870 Manufacturer and Builder Magazine)
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