Boy Advance SP, Nintendo DS, and Nintendo 3DS, though these are less frequently described as "flip" or "clamshell" compared to smartphones. Other appliances like pocket watches, waffle irons, sandwich toasters, krumkake irons, and the George Foreman Grill have long utilised a clamshell design. Bookbinders build archival "clamshell" boxes called Solander cases, in which valuable books or loose papers can be protected from light and dust. See also "Communicator" (Star Trek), fictional forerunner of the "flip phone" (US, 1964) Grillo telephone, early "flip phone" (Italy, 1965) Dual-touchscreen References Industrial design