In 1926, General Motors (Australia) Limited was established with assembly plants at Newstead, Queensland; Marrickville, New South Wales; City Road, Melbourne, Victoria; Birkenhead, South Australia; and Cottesloe, Western Australia using bodies produced by HMBB and imported complete knock down chassis. In 1930 alone, the still independent Woodville plant built bodies for Austin, Chrysler, DeSoto, Morris, Hillman, Humber, Hupmobile, and Willys-Overland, as well GM cars. The last of this line of business was the assembly of Hillman Minx sedans in 1948. The Great Depression led to a substantial downturn in production by Holden, from 34,000 units annually in 1930 to just 1,651 units one year later. In 1931, GM purchased HMBB and merged it with General Motors (Australia) Pty Ltd to form General Motors-Holden's Ltd (GM-H). Its acquisition of Holden allowed General Motors to inherit an Australian identity, which it used to cultivate nationalist appeal for the firm, largely through the use of public relations, a then novel form of business communication which was imported to Australia through the formation of General Motors (Australia) Limited. Throughout the 1920s, Holden also supplied 60 W-class tramcar bodies to the Melbourne & Metropolitan Tramways Board, of which several examples have been preserved in both Australia and New Zealand.