The simple screw feeder, however, was developed by several companies into a device that can feed successfully into conveying lines at pressures of up to 2.5 bar gauge. One such device, which was manufactured by the Fuller Company of the USA, is known as a Fuller–Kinyon pump. In Germany, Claudius Peters developed a similar Peters pump at about the same time. A sketch of this type of screw feeder is given in Figure 4.1.