1 February 21,1804: The first self-propelling steam locomotive makes its outing at the Pen-y-Darren Ironworks in Wales.

2 Blades design is a important aspect in the self-propelling cultivator design.

3 A series of indicators reveals the shift to "China Continental"– the transition of the world's most populous country into an increasingly self-propelling economic force.

4 So what is the actual cause of the seemingly self-propelling stones?

5 It features quick control response, high accuracy, good stability and wide scope of adaption. It will be widely applied in self-propelling type machinery.

6 This paper presents a kind of method without guide to guide a self-propelling machining operation.

7 In this paper, target data smoothing in the fire control of a self-propelling anti-aircraft gun is analyzed and the formula of delay from the data smoothing presented.