type A
type B
type C
PHILIPS-INFRAPHIL-13373F-LAMP
From around 1950 the Infraphil heat
lamps carried the type number
13373F/479, independent of the armature
they were delivered with. In the mids of
the 1950s the front of the glass bulb
became more flattened. This version of
the lamp was produced until about 1965
and it existed with three types of print on
the front. The oldest print with the
Infraphil logo as used on the early lamps
(type A), a later print with a circular text
without logo or word mark (type B) and
finally a print with three Philips shield
emblems in a circular configuration (type C). In 1964 the production code indication
with points and stripes was changed into a single character and a one-digit number
as can be seen in the B- and C-type prints.
