From the early 20th century into the 1970s, Americans used punched cards to enter data into tabulating equipment and then electronic computers. This is an early key-operated punch, based on patents of ...

After graduating from high school, I was hired at Allis Chalmers in a newly created department. I was to be trained as a key-punch operator. Very few persons knew what I was doing. Working at a ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. From the early 20th century into the ...