SV1XV's photos with the keyword: 15735484755

Vintage Paragon vacuum tube (valve) control No.70, Adams-Morgan Co., with a UV-200 vacuum tube, circa 1920 - 1921. Photo by Joe Haupt, uploaded on Flickrt under a CC-BY free license. Flickr image: www.flickr.com/photos/51764518@N02/15735484755 This work is licensed under a Creative Commons Attribution 2.0 International License .