The Tungsten Manufacturing Company was an automotive accessory company operating from about 1915 to 1920. L R Willard and G H Ruth formed the Marshall Oil Company in Marshalltown, Iowa in 1896. The company began with $2500 borrowed capital and 13 barrels of oil. From this beginning, they created the largest company in Marshalltown with branches throughout the country. Brand names included Rex, Weoline, and French.
Tungsten Manufacturing was created by Marshall Oil to market automotive accessories. Most notable was a spark plug with blue porcelain. This product was advertised heavily in the 1917-1920 era. The company developed financial problems and was sold in 1923.
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