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

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This electrotype printing block is ...

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 ...