目的：
分别检验成品灯上BA9、B15、B22和BY22d灯头的尺寸Amin.
检验：
如果量规仅靠其自身重量不能套进成品灯头上，则该灯头应视为合格。检验B15灯头的量规也可用于检验未组装的灯头。
检验B15灯头的量规也可用于检验未组装的灯头。
Purpose:
To check dimension A min. of caps BA9, B15, B22 and BY22d on finished lamps respectively.
Testing:
Caps on finished lamps shall be assumed to be correct if the gauge does not pass over the cap by its own weight.
The gauge for B15 may also be used for checking unmounted caps.
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