Vintage Hewlett Packard HP20S scientific programmable calculator, circa 1987, made in Singapore. Photograph by Joe Haupt uploaded on Flickr under a CC-BY-2.0 free license.

Flickr file: www.flickr.com/photos/51764518@N02/54447073463

Short URL: flic.kr/p/2qXiu2V



This work is licensed under a Creative Commons Attribution 2.0 International License.