Very good, Podga! I think that is as close as anyone could get and the "mid-1930s" was dead on.
Here's the scoop:
The picture was taken in June 1937 in the offices of the Social Security Administration in Baltimore, Maryland. "For every Social Security account number issued an 'employee master card' is made in the Social Security board records office. Testifying data, given on the application blank form SS-5, is transferred to this master card in the form of upended quadrangular holes, punched by key punch machines, which have a keyboard like a typewriter. Each key struck by an operator causes a hole to be punched in the card. The position of a hole determines the letter or number other machines will reproduce from the master card. From this master card is made an actuarial card, to be used later for statistical purposes. The master card also is used in other machines which sort them numerically, according to account numbers, alphabetically according to the name code, translate the holes into numbers and letters, and print the data on individual ledger sheets, indexes, registry of accounts and other uses. The photograph shows records office workers punching master cards on key punch machines."
Keypunched cards were used beginning early in the 19th century to program looms. Hollerith cards and IBM cards first appeared in the late 19th century. The "80 column cards" were still widely used in the banking industry in the 1970s. I remember programmers punching their own cards because they didn't trust the professional keypunch machine operators. I never heard the operators complain. For more on the history of keypunch cards and a lot of old photos, see http://en.wikipedia.org/wiki/Keypunch.
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Your turn to challenge us, Podga.