This stroller that would protect babies from gas (1938).
A single-wheeled motorcycle (1931)
A bicycle that fit the whole family… plus a sewing machine (1939).
A contraption that would let you smoke in the rain (1931).
An amphibious bicycle that you could use on land and in water (1931).
A hat integrated with radio (1931).
A piano that could be played while lying in bed (1935).
A revolver that takes a picture right before the shot is fired (1938).
This portable extension bridge (1926).
A device that would help you teach your children how to walk (1939).
Source : Imgur