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In 2017, Callaway acquired OGIO, a US-based bag and apparel brand, and TravisMathew, a California-based lifestyle and golf apparel brand. [16] [17] In 2019, Callaway acquired German outdoor apparel company Jack Wolfskin. [18] On October 27, 2020, Callaway announced it will acquire Topgolf Entertainment Group for $2 billion. [19]
Big Bertha is the name given by Callaway Golf to a number of its lines of golf clubs.The name was chosen to evoke the famous German Big Bertha howitzer.. The original Big Bertha driver was launched in 1991.
GJV at a magnification of 100:1. Compacted graphite iron (CGI), also known as vermicular graphite iron (GJV, VG, [1] JV [2] or GGV from the German: "Gusseisen mit Vermiculargraphit" [3]) especially in non-English speaking countries, [4] is a metal which is gaining popularity in applications that require either greater strength, or lower weight than cast iron.
Gray iron, or grey cast iron, is a type of cast iron that has a graphitic microstructure. It is named after the gray color of the fracture it forms, which is due to the presence of graphite. [ 1 ] It is the most common cast iron and the most widely used cast material based on weight.
Natural graphite, or commercial natural graphite, contains 5 to 15% rhombohedral graphite [24] and this may be due to intensive milling. [25] The alpha form can be converted to the beta form through shear forces, and the beta form reverts to the alpha form when it is heated to 1300 °C for four hours. [24] [23]
While most varieties of cast iron are weak in tension and brittle, ductile iron has much more impact and fatigue resistance, due to its nodular graphite inclusions. Augustus F. Meehan was awarded U.S. patent 1,790,552 in January 1931 for inoculating iron with calcium silicide to produce ductile iron subsequently licensed as Meehanite , still ...
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