[78-L] Approximating 78s age by physical characteristics

[David London]

I would like to know if it possible to guess approximately how old a 78 is
by some of it's physical characteristics.  For example, here's a list of
some things in common with most 78 records, that seem to change in
correlation to age from oldest to newest.

Start point:  one-sided records, no lead out groove,no paper label

large paper label
lead-out groove added
change to small paper label
added eccentric lead-out groove
added lead-in groove
first laminated pressings

Is it possible to put approximate dates - even roughly like early/mid/late
which decade, against things like this, when they were first/last used
commonly? Are there other indicators of age that could be added to this
list?