只有一个输入的数字电路单元是缓冲器或反相器，而输入在一个以上的则称为逻辑门。
Only one input of the digital circuit unit is the buffer or inverter, the input in more than one are called logic gates.
销售的主要产品：导向轮、轿厢、厅门、门机、上坎、限速器、夹绳器、安全钳、缓冲器、绳头组合、五方通话、导轨等电梯部件，广泛应用于客梯、住宅梯、货梯等各类电梯。
The major products are the lift parts such as the car, hoist-way door, door machine , upper sill, speed governor, rope gripper, catch block , buffer etc.
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