He had built a logic gate - to be precise, a NOR gate.

他等于建造了一个逻辑门-准确地讲是一个或非门。

It consists of five types of fundamental circuits including inverter, NAND gate, NOR gate, ternary inverter and T-gate.

其中包括倒相器与非门、或非门、变形反相器和T门共五种基本电路。