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  2. Exploration diamond drilling - Wikipedia

    en.wikipedia.org/wiki/Exploration_diamond_drilling

    Diamond core drill bits. Rodolphe Leschot is often cited as being the inventor of the first core bit in 1863. [1] Early diamond drilling opened up many new areas for mineral mining, and was related to a boom in mineral exploration in remote locations. Before the invention of the portable diamond drill, most mineral prospecting was limited to ...

  3. Core sample - Wikipedia

    en.wikipedia.org/wiki/Core_sample

    Rock core samples, the product of a diamond rig.A pied butcherbird perches nearby.. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill.

  4. Jeffrey Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Jeffrey_Manufacturing_Company

    In 1926, the company acquired the British coal machine manufacturer The Diamond Coal Cutter Company Limited of Wakefield, and renamed it the British Jeffrey-Diamond Company. On 28 December that year, [15] they also acquired the Galion Iron Works, which built road rollers and graders. Between 1951 and 1962, 80% of the Jeffrey Manufacturing ...

  5. Marble Cliff Quarry Co. - Wikipedia

    en.wikipedia.org/wiki/Marble_Cliff_Quarry_Co.

    In 1985, the Kaufmans sold the 2,000-acre (8.1 km 2) quarry to investors who filled in and developed the quarry for residential use, including Marble Cliff Commons [6] [2] [3] apartments and Marble Cliff Crossing, a 100 single-family and 60 double-family subdivision built between 1998 and 2003. [7]

  6. Energy in Ohio - Wikipedia

    en.wikipedia.org/wiki/Energy_in_Ohio

    Thomas Edison, a native of Milan, is widely regarded as the originator of mass-energy generation and distribution concepts.. The energy sector of Ohio consists of thousands of companies and cities representing the oil, natural gas, coal, solar, wind energy, fuel cell, biofuel, geothermal, hydroelectric, and other related industries.

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