This June 7, 2011 photo shows a mine vehicle, powered by a Harley motor, at the Harley-Davidson Museum in Milwaukee. The cart, which was created by a mine worker in northern California around 1926, is part of a new exhibit, “Collection X: Weird, Wild Wonders of the Harley-Davidson Museum”. Photo: AP
This June 7, 2011 photo shows a liquid-cooled motocross bike at the Harley-Davidson Museum. This bike is from 1978, when the company considered getting into that market. Photo: AP
This June 7, 2011 photo shows a three-wheel vehicle, called “Project K” from the mid-1980s when the company was experimenting with making car-motorcycle hybrid. Photo: AP
This June 22, 2011 photo shows a chopper made entirely from leather at the Harley-Davidson Museum in Milwaukee. The chopper is one of several hundred pieces at the exhibit. Photo: AP
In this June 7, 2011 photo, Harley-Davidson Museum curator Kristen Jones stands with an aviator's mask at the Harley-Davidson Museum in Milwaukee. The mask was used by motorcycle riders in the 1920s to protect them from the elements. Photo: AP
In this June 7, 2011 photo, Bill Davidson, great-grandson of Harley-Davidson Motor Company co-founder, stands near the Rikuo motorcycle at the Harley-Davidson museum in Milwaukee. The Rikuo model was the first motorcycle manufactured in Japan. Photo: AP
