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据法国《工程》1978年521～522期报道,美国福斯特公司在汉诺威博览会上展出一种新的振动打拔桩机。4000型样机,重102吨,工作频率为0～1400次/分钟,摆幅为8～32毫
According to the French “Engineering” 1978 521 ~ 522 period report, the United States Foster company in Hannover Fair on display a new vibration pulling pulling machine. 4000 prototype machine, weighing 102 tons, the working frequency is 0 ~ 1400 times / min, the swing is 8 ~ 32 milliliters