The vintage inventions include:
1.Underwater propeller belt
2.Helicopter boat
3.Train cars that ride over one another
4.Zip lines that attach to your head
5.Monowheel one wheeled car (large)
6.Beard swim suits that keep your facial hair dry while
swimming
7.Portable changing rooms for the beach
8.Car ack that uses the exhaust to lift the car
9.An automatic robotic lawn mower
10.A bicycle lawn mower
11.Self-launching life boats
12.Static electricity assisted haircuts
13.Monowheel one wheeled car (small)
14.A pedal propelled standing mini scooter
15.Motorized skates
16.Early version of roller skates
17.A mechanical exoskeleton for assisted walking
18.A motorized mechanical horse
Some of these could work today with some restructuring