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ES252590A1
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Useful for perforation of rocks (Machine-translation by Google Translate, not legally binding)
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ES207345A1
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A device adaptable to the rod of the barrier of a perforator for rocks and similar (Machine-translation by Google Translate, not legally binding)
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ES176899A1
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A device for the formation of chambers in barreno holes
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ES144075A1
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A new system for feeding an oven and recovering gaseous products from it.
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CA520963A
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Mining trepan
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CA666248A
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Outil de perforation de roches
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CA406633A
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Lime kiln
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CA406632A
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Kiln feeding apparatus
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CA472230A
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Scraping out devices for mining boreholes
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