Because the primary focus was on the dairy industry, the model numbers represented the number of imperial gallons of milk that could be carried. Between 1948 and 1952, the company sold a large number of Graiseley PCVs to United Dairies, and gradually diversified into stillage trucks and pallet trucks for use in factories. The company was liquidated in 1960, but the Graiseley marque was used by Lister Graiseley in 1969 and by Gough Industrial Trucks Ltd of Hanley, Stoke-on-Trent in 1971. Harbilt electric vehicles were initially produced by the Market Harborough Construction Company, which was formed in 1935 as a manufacturer of aircraft components. After the end of the Second World War, they diversified, and electric vehicles were a part of their new product range. The first vehicle produced was the 551 pedestrian controlled vehicle, which they supplied with a charger made by Partridge Wilson of Leicester, who were making their own range of Wilson battery vehicles. As well as milk delivery, the chassis was popular in Switzerland, with some 2000 vehicles supplied to the Swiss Post Office and to Swiss hotels. From 1956, they introduced ride-on vehicles, beginning with the model 735, and expanded the range considerably over the next few years. The Dairyliner range was showcased at the Royal International Dairy Show held at Olympia in October 1970. At some point in the early 1970s, prior to 1974, Harbilt and Morrison-Electricars reached an agreement for a product exchange and rationalisation. All milk floats would be built by Morrisons at their Tredegar works, while Morrison trucks would be handed over to Harbilt. The electric vehicle facility was taken over by a management buyout in 1975, and registered as Harbilt Electric Trucks. It continued to make trucks for a variety of industries, until it was bought for almost twice its share value by Fred W Davies, a Canadian who owned the Davies Magnet Group and York Trailers, in 1987. Production moved to Corby, but the venture was short-lived, and it was sold again to M&M Electric Vehicles of Atherstone in 1989. Lewis Electruks were built by TH Lewis Ltd of Watford, a company closely associated with London's Express Dairy Company. Lewis began building milk floats, milk carts and horse-drawn vehicles for Express Dairies in 1873, and the business became a limited company in 1899. It was taken over by Express in 1931, as part of a reorganisation of their business. TH Lewis designed two types of electric vehicle for Express, the first of which entered service in 1934.