Pin Cap (G.B.)
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2-3-125
A cap (types F, G) which has one or more pins for fixing it in the lampholder.
Reference: C.I.E.
Note 1: For particular numbers of pins, terms such as Three-Pin Cap are employed.
Note 2: In the U.S.A., a lamp having a cap with two pins is called a Bi-Post Lamp.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)