描述电子管和类似半导体器件的额定值系统。其目的是使人们对这些系统有更深入的了解，尤其是在制造商和电路设计师之间的责任划分方面。

Describes rating systems in use for electronic tubes and analogous semiconductor devices. Its object is to bring about a greater understanding of these systems, especially in the division of responsibility between the manufacturer and the circuit designer.