ELECTRIC INCANDESCENT LAMP

摘要

PHN. 9917 7 An electric incandescent lamp according to the invention has a lamp envelope the pinch of which extends in a recess of an insulating body and is secured to body by means of cement. The insulating body forms part of a lamp cap. On the surface of the pinch a projection is present which determines the depth to which the pinch extends in the recess of the insulating member.