Rough Service Lamp
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2-3-165
An incandescent lamp so constructed as to withstand mechanical shocks and vibrations.
Note: In the U.S.A., Vibration Service Incandescent Lamp designates a lamp to withstand vibrations while burning.
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)