Old inventions that never caught on

These old vintage inventions didn't quite make the cut. The vintage inventions include: Underwater propeller belt Helicopter boat Train cars that ride over one another Zip lines that attach to your head Monowheel one wheeled car (large) Beard swim suits that keep your facial hair dry while swimming Portable changing rooms for the beach Car jack that uses the exhaust to lift the car An automatic robotic lawn mower A bicycle lawn mower Self-launching life boats Static electricity assisted haircuts Monowheel one wheeled car (small) A pedal propelled standing mini scooter Motorized skates Early version of roller skates A mechanical exoskeleton for assisted walking A motorized mechanical horse Credit: Gizmo!