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2. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)

3. List of copper ores - Wikipedia

   en.wikipedia.org/wiki/List_of_copper_ores

   Following is a list of minerals that serve as copper ores in the copper mining process: [1] Image Name Formula % Copper when pure Chalcopyrite: CuFeS 2: 34.5 Chalcocite:

4. Chino mine - Wikipedia

   en.wikipedia.org/wiki/Chino_Mine

   The mine was started as the Chino Copper Company in 1909 by mining engineer John M. Sully and Spencer Penrose, [1] [2] [3] and is currently owned and operated by Freeport-McMoRan Inc. subsidiaries. The area where the mine is located is at an average elevation of 5,699 feet (1,737 m).

5. Aggie Grey - Wikipedia

   en.wikipedia.org/wiki/Aggie_Grey

   In 1903 her mother died and she was raised by her father and later by him and her step mother. Aggie Grey is the subject of two biographies by Nelson Eustis [3] and Fay Alailima, [4] was on several postage stamps of Western Samoa, [5] and was a pioneering figure of the Samoan hotel industry. [6] Aggie Grey died in 1988. [7]

6. Vickers hardness test - Wikipedia

   en.wikipedia.org/wiki/Vickers_hardness_test

   The corresponding unit of HV is then the kilogram-force per square millimeter (kgf/mm 2) or HV number. In the above equation, F could be in N and d in mm, giving HV in the SI unit of MPa. To calculate Vickers hardness number (VHN) using SI units one needs to convert the force applied from newtons to kilogram-force by dividing by 9.806 65 ...

7. Metallurgy in pre-Columbian America - Wikipedia

   en.wikipedia.org/wiki/Metallurgy_in_pre...

   Sican tumi, or ceremonial knife, Peru, 850–1500 CE. Metallurgy in pre-Columbian America is the extraction, purification and alloying of metals and metal crafting by Indigenous peoples of the Americas prior to European contact in the late 15th century.