Science, Technology & Medicine

McBee Keysort edge-notched cards
McBee edge-notched cards
Information (such as a checked-out book's due date in a library) could be encoded
by punching notches at the appropriate spots.  The cards could then be manually
sorted by passing a stylus through the holes; the notched cards would fall out.

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Posted by packratjohn at 2:07 pm (PST) on Mon November 7, 2011   
Wasn't this the origin of chad???? (just kidding, but it would explain those mysterious overdue charges I had)

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