While some are truly obsolete (ie floppy disk), many are now either niche items (ie quill pens) or parallel technology (ie radio). It might be fun to have students create their own video clips for a Museum of Old Technology!
"The Museum of Obsolete Objects is an online exhibit dedicated to inventions that have long since hit their sell-by dates. Each object gets its own short video (narrated by a computerized voice that is itself outdated). Working backward, you'll see clips about the computer mouse (not yet extinct, though the museum tells us it will be in just a few years), the fax machine, the floppy disk, the abacus, the eggbeater, and other everyday objects."