continued... After World War II, the Post Office couldn’t hire people or buy machines fast enough to keep up with the ever increasing volume and they were taxed to their limits. In order to help move mail faster, in the early 1960s, they created the Zoning Improvement Plan — AKA ZIP code — system. The first number indicates region, second and third number city and the last two indicate the specific post office it goes to. Now ZIP codes are used to shape everything from voting districts to marketing campaigns.
It sounds like in the 1960s, they also began implementing machines capable of reading the printed word, meaning that humans didn’t have to process the mail anymore. In 1982, the Post Office starting putting barcodes on mail so that machines could process the mail even faster. The barcodes started with the zip code, but as mail processing has become more sophisticated, they’ve added more numbers to the barcode. Nowadays (at least when the exhibit was made) it’s a 31-digit barcode that sorts the specific route’s mail into the order in which it is delivered.
In the early days of barcoding, postal workers hand-typed the information into barcode printers. Over the years, the machines have become sophisticated enough that they can read the address, print and affix their own barcodes, and sort the pieces of mail into appropriate sorting bins without any human intervention. The machines can even read all but the worst handwriting. If an address is undecipherable, the machine takes a photo and sends it to a Remote Encoding Center, where a person figures out the address, sends it back to the machine, and then the machine prints and affixes the barcode.
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