I’ve gone gaga over Bakelite ‘n plastic ukuleles in past posts, however, this device, attached to the neck of one of these gems allowed one to play 6 — count ‘em SIX! — chords at the touch of a button! Sounds a bit like Ford’s old "teletouch" transmissions.
ChordMaster.org’s stupendous compendium of plastic ukes, ads, gadgets, and folks happily playing (sometimes underwater — why not? it’s plastic!) is worthy your leisurely perusal. You’ll be amazed by such models as the Islander Ukette, T.V.Pal, Uke-A-Doodle, Ukeatune, Mousegetar, and many, many more!