In the early 1940s, Roy O. Billings, president of the Milwau-kee Hydraulics Corp., saw the need for a small mobile crane that would be safer, easier to operate; and lower-priced than the heavy friction-operated cranes of the day. With more reliable, higher-pressure hydraulic systems coming on the scene, he decided to apply this new technology to his concept. He designed and built a truck-mounted hydraulic crane with a telescopic boom and hydraulically operated outriggers. He named it the Hydrocrane and launched the first-model-the H-2-in 1946, as one of America's first-ever hydraulic cranes. It was a simple and highly mobile machine that became an instant success, and by the end of the following year, he had sold some 200 of them.
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机译：在1940年代初，Milwau-kee液压公司的总裁Roy O. Billings看到了对一种更安全，更易于操作的小型移动式起重机的需求。并且价格比当时的重型摩擦操作起重机低。随着现场出现更加可靠，高压的液压系统，他决定将这项新技术应用于他的概念。他设计并制造了带有伸缩臂和液压支腿的车载液压起重机。他将其命名为Hydrocrane，并于1946年推出了第一款H-2型起重机，这是美国历史上第一台液压起重机之一。这是一台简单且高度移动的机器，立即获得了成功，到第二年年底，他已经售出了200台左右。
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