Dear Patrick,
> I've been trying to research the date a particular sign was posted on
> my property in Glendale, California. When I saw that it had the
> company's name (Pacific Fence Co.) and a very old 2L-4N phone
> number ( Hillside 8141 ), I grew to wonder when Los Angeles would have
> made the transition to 2L-5N, because I could probably figure the sign
> predates that time.
> My property was built in 1926. I'm guessing that Los Angeles switched
> over sometime after WWII and before 1949, but I can't get a better fix
> on that. Any chance you know where to look?
The chances are very good that the GLENDALE PUBLIC LIBRARY has old telephone books for Glendale.
If not, it is a safe bet that the L.A. (the city proper) Library has L.A. phone books going back that far.