gone!'. In 1936, Hoover introduced the top-of-the-line Model 150. It had a time to empty bag indicator; automatic height adjustment; a magnesium body, which made it weigh less than previous models; instant tool conversion; and a two-speed motor. One of the first Dreyfuss designs for Hoover, it was the symbol of the machine age; the beautiful Bakelite hood hid the entire motor from view and there were no protruding knobs or gadgets. It was the first Hoover cleaner that was not of the traditional "coffee can" style, which Hoover had been using since its earliest years. The cleaner sold from 1936 to 1939 and was priced at $80 ($ today). Two other lower-priced Hoovers sold along with the 150: the Model 25 (1937–38), which was the middle-of-the-line cleaner priced at $65 ($ today), and the Model 300 (1935–38), which became the bottom-of-the-line cleaner and sold at $49.75 ($). Due to the backdrop of the Great Depression, Hoover produced only 166,000 150s in its three-year production run. From 1941 to 1945, Hoover ceased all vacuum cleaner production and converted the North Canton, Ohio factory to support the war effort. When World War II ended in 1945, Hoover started producing cleaners again and unveiled the Model 27 for post-war America to enjoy. In 1950, Hoover introduced the Veriflex, which was the first rubberized suction hose in the industry. Other cleaners at the time were using cloth-braided hoses, which would deteriorate and lose suction over time. In 1954, Herbert W. Hoover Jr. took over the presidency of the company from his father. A nephew of the founder, H. Earl Hoover, also served as chairman and honorary director. The sombre and restrained colors of the previous decades gave way to bright, striking modern color-schemes, starting with the Hoover Model 29 in 1950, which was red instead of the regular black and brown colors of the past. This was part of their policy of the continual development and modernization of their output. In 1957, Hoover introduced the Convertible Model 65 (the De Luxe 652 in the UK). It was the last machine designed by Henry Dreyfuss, the industrial designer who had worked with the company since the early 1930s. This cleaner introduced what Hoover called 'Automatic Shift', a system whereby the tool converter plugged into the rear of the cleaner. This was not a new idea: instant tool conversion had been introduced in 1936 with