DIN EN 60061-3/E21-2007 可轉換性和安全性控制用量規及燈頭和燈座. 第3部分: 量規(IEC 60061-3-1969+附件A: 1970, U: 1997+ A20: 1998, A37: 2006, 修改件)
Lamp caps and holders together with gauges for the control of interchangeability and safety-
Part 3: Gauges (IEC 60061-3-1969+supplements A:1970 to U:1997+ A20:1998 to A37:2006, modified);
German version EN 60061-3:1993+A1:1995 to A7:1997+A20:1998 to A3