</font><font color="blue" class="small">( I also remember the pop-top caps and the vending machines that you had to slide the bottle around to the corner that would let it come out (if you paid). Guys (don't remember ever doing it) would pop the tops and drink the pop from a straw without paying. Guess that is why they made vertical racks in the vending machines )</font>
When my Dad bought a Texaco service station in Oklahoma in June, 1956, we had the former type of vending machine (it also had a little water fountain on one end). Then in November, 1956, he bought a Mobil service station in Texas and it had two of the latter type of vending machines. All those machines, at that time, took a nickel. I don't remember exactly when it was, but sometime in 1957, retail prices went up to 6 cents and they changed all the mechanism in the machines so they took a nickel and a penny. And that didn't last hardly any time at all (I think in the same year, but if not, early 1958) before prices went up to 10 cents and all the vending machines were changed again to take a dime. And lots of people were outraged that the price of sodas doubled in less than a year.