NEN 10061-1-1993 (IEC 61-1-1969 + N-1992的补充件 A-1970,修改)灯头,灯座及其互换性和安全性检测用量规.第1部分:灯头
Lamp caps and holders together with gauges for the control of interchangeability and safety. Part 1: Lamp caps (IEC 61-1:1969 + supplements A:1970 to N: 1992, modified)