The first devices, developed in the 1950s and 1960s, were large machines placed on trolleys next to the patient and attached by tubes.
2
体外无粘性筋是指安置在原始混凝土结构外部，只能通过锚固和变向装置连接至结构上的钢筋。
P an external non-bonded tendon is a tendon situated outside the original concrete section and is connected to the structure by anchorages and deviators only.
3
标准尺寸的孔与气动执行机构连接。中间为一伸出体外的方身，直接与气动执行机构内八角相连。
Hole of nominal size connects with pneumatic operation organ, Threr is a square body protruding out which directly connects with the internal octagon of pneumatic operation organ.
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