The USPS gets a lot of bad press,but there were,and still are some amazing employees at the USPS.
In 1988 they had a machine called the LSM(Letter Sorting Machine),
Which had 12 keyers,and 4 sweepers that removed the mail from the bins it was sorted into,and 1 supervisor.
The total output of the machine was 40000 pieces per hour.
The mail piece was moved through the machine in front of each keyer at the rate of one piece per second.In this one second,they had to remember the proper zip code,and key it via a very primitive specialized keyboard.
They had to know every zip code in the United States,and retrieve that info from memory in one second.
Some streets have multiple zip codes,depending on the address.
The machine sorted to a reject bin if no code was entered and it reflected which keyer station it came from.
The keyers had to key 99% or they would be sent back to retraining.
The previous machine required the use of foot pedals,like an organ,and the zip code had to be keyed in Octal format using pedals and keys.
These machines were eventually replaced by more advanced technology with machines that could read and sort at the rate of 40,000 pieces per hour with only one operator,and one sweeper.
Very little mail is hand sorted now,only if oversized or registered or certified mail.
Hats off to the ones that had such a demanding task and performed it so well.
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