This ten-key printing manual adding machine has an black iron and glass frame with a steel keyboard painted green. Two rows of white plastic number keys are marked with digits and their complements ...

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 full-keyboard printing manual ...

As part of All Things Considered's series on now-obsolete sounds, listeners recall fond memories of the old mechanical adding machine. We asked listeners to send sounds from older technologies, things ...