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The model 9 introduced entirely new fonts while retaining
a slightly refined model 7 burner and model 8 wick raiser.
This design carried through models 10 and 11.
The burner base and outer wick tube used on models 9, 10
and 11 remained the same as the model 7 and 8 burners. The
model 8 wick raiser was also used unchanged. There were minor
changes to the construction of the flame spreader and gallery
from the earlier lamps.
The model 9 was in production for two years and was sold
concurrently with the model 10 during the second year.
There are two versions of the model 9 lamp. The early version
has the model 9 designation below the diagonal Aladdin logo
on the wick raiser knob and the table font has a wide flat
bottom flange in the model 6 style.
The late model 9 version, like the models 10 and 11 have
the model designation over the diagonal Aladdin name and a
table font that has a narrower crimped foot flange.
The early model 9 used the same mini wick holder that was
used on the model 8 The mini wick holder disappeared with
the introduction of the reinforced wick that has built in
mounting tabs. This appears to be around or just a little
before the time when the model 10 was introduced.
The model 10 and 11 lamps are basically identical in design
to the late model 9 making them essentially marketing "upgrades"
and not technology upgrades.
I would guess that the early model 9 style was in production
during the first year and the late style was in production
during the second year when model 10 was concurrently produced.
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