Leicester storey of Walker's Oxford Street factory in Leicester. In the early days the potatoes were sliced by hand and cooked in an ordinary fish and chip fryer. In 1971 the Walker's crisps business was sold to Standard Brands, an American firm, who sold on the company to Frito-Lay. Walker's crisps makes 10 million bags of crisps per day at two factories in Beaumont Leys, and is the UK's largest grocery brand. The Beaumont Leys manufacturing plant is world's largest crisp factory. Meanwhile, the sausage and pie business was bought out by Samworth Brothers in 1986. Production outgrew the Cobden Street
Oil shale in China oil production or the oil shale-based power generation. After 2005, China became the largest shale oil producer in the world. In 2011, the country produced about 650,000 tonnes of shale oil. Most of production facilities are Fushun-type retorts. At the end of 2006, the Fushun Shale Oil Plant was the largest oil shale plant in the world. In 2005, the China National Oil Shale Association was established in Fushun. The main oil shale research institution in China is the China University of Petroleum. From 2004 to 2006 China undertook the national oil shale evaluation. According to the evaluation, it has