Like a library... each part number had a card. You probably got a package from the dealership with the good initial ones printed... Part number, year make model applicability... Want a part? look up the section. Is it in stock, how much, when to order more all the info there. Looks like this became an utter mess after a while. Number of parts on cars exploded and you had to continue to maintain hundreds of thousands of cards. I have examples into the 60's from the 40's.
Edited by mikes2nd 2020-02-29 12:54 PM
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