In reading a book about the Key System railway, older schedules had a
> six-digit phone number (2L-4N) while newer ones had seven-digits > (2L-5N).
> Would anyone know when Oakland converted?
> Also, was six digit dialing (2L-4N) common in a lot of places? I
> though most city dial offices were 5 digit for smaller cities and 7
> digit (3L-4N) for larger cities. The seven digits were used as part
> of the panel installation for cities expecting growth and to provide
> for automatic integrated dialing to/from suburban areas as well.
I used to ride the Key System railway. I remember when the SF Bay Bridge ran the trains and trucks on the bottom level and cars on the top level. At that time, I lived in Kensington. My home phone number was LAndscape 6-5520. My father's work number in Berkeley was LAndscape
4-1757. So, in the mid-1950s, I think the SF bay area was pretty much all 7 digit.
Harold