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Posted By: ramram

Considering that there is a phone number on the side of the card, does anybody know when phone numbers had progressed enough to be a four-digit number? Telephones were just being developed in the 1870's and 1880's and inititially required a single button to be pushed. It would be interesting to know if the phone systems had developed into the Louiville area enough to require the four-digit numbers by the late 1890's or possibly not until the 1920's. Does anybody have some old business letterheads from the 1890's that have phone numbers on them?

Rob M.