Phone numbers were used several times, which I am assuming were of the
> 2L-4N format -- They were given as name plus four digits and I believe
> from previous discussions here that Los Angeles never used 3L-4N > numbering.
I don't know about previous discussion here, but Los Angeles indeed progressed from 2L-4N to 3L-4N.
Downtown Los Angeles, for example, was the MAdison Exchange. I remember lots of very public numbers in that exchange that were MA 1234 (for example) then became MA 5 1234, and so forth.
Same for HOllywood.