Aerocab
A floating taxicab.

Atomic Shell
A nuclear munition, fired from a cannon.

Force-Ray
A large, hand-held spear of force.

Hypnotelevisor
A device that displays memories directly on a helmet screen.

Mechanical Hand
A large robotic hand or claw, large enough to grasp a person.

Metalloglass
A transparent "glass" made of metal.

Reflectocosmic Spectrometer
A device that detects and measures cosmic rays that reflect from different metals.

Remote Telepresence Robot
A very early depiction of this basic idea.

Rocket Pistol
Using pistol rounds to maneuver in space.

Ship Pushes Moon
Altering the course of a small moon by pushing on it with a rocket motor.

Ship's Artificial Gravity
A very early mention of the term.

Ships With Legs
Space ships with mechanical limbs for walking the Earth.