This standard specifies the appearance and main dimensions of the M-type series electric light source glass bulb. This standard applies to M-type series electric light source glass bulbs.
QB/T 2049.6-1994 history
2013QB/T 2049.6-2013 Glass bulb dimensions for lamps.M series shapes
1995QB/T 2049.6-1994 Glass envelope of electric light source Dimension of M model glass envelope