Scans of extracts from
the Combs patent of 1931
.

It is interesting that Figure 1
does not correspond exactly to
any of models
21,  70 or 90
that used this general cabinet
design (along with two battery
models). The closest is 21,
based on knob configuration,
though the escutcheon is
different. This model was the
first to adopt the style.

There is some evidence that a
model 50 was produced using
this cabinet (
radioattic
archives) though this may not
be authentic. The knobs
certainly do not look like Philco
originals but more like the
knobs from a GE/RCA set.  To
its credit, the spacing between
the lower knobs, consistent
with the model 50, is wider than
for any of the other models
and there is no evidence of the
front panel having been
altered (assuming the front
panel is not a reproduction)
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