Even early century breweries had a "tab" system. Though not computerized, the barkeep had a chalkboard behind the bar. Back then, beer and brews were sold in pints and quarts. So, the bartender had a column for Pints and a column for Quarts. When a customer consumed too much, the barkeep may have been known to say, "Mind your Ps and Qs" or be careful how much you drink
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