Accelerated Schooling
Knowledge force-fed directly into the brain.

Accelerated Schooling Helmet
A device that stimulates the brain and imparts knowledge directly.

Anti-agathic drugs
Drugs that indefinitely postpone death from old age.

Battle Tank Display
Three-dimensional display showing tactical information for space battles.

Bethé blasters
Powerful enough to destroy a flying city.

Brood Assembly - first self reproducing automata
Artificially intelligent computers that can replicate themselves.

City Fathers - AI with centuries of experience
A set of computer systems which run every mechanical system in a city.

Crop Algae
Growing algae in tanks as a source of basic food stock.

Dirac Transmitter (also Tranceiver or Communicator) - instant communication
A device that provides instantaneous communication anywhere in the galaxy.

Eavesdropper - check if it's safe
Device to detect the presence of recording devices.

Gravity-Polarized Explosive (TDX)
A chemical explosive that acts at an angle to the local gravitational field.

Inter-Universal Messenger
A device intended to travel to another dimension.

Machine Psychologist - computer psychiatrist
A computer that understands and uses its knowledge of human psychology to benefit human users.

Machine Surveillance - first mention of idea
The use of artificially intelligent computer systems to learn by monitoring all human interaction within a city.

Proselytizing Robot
A robotic preacher; designed for use where believers are unwelcome.

Space Armor
Armored space suits for use in vacuum.

Spindizzy - pick up your town and go
A device that made use of a relationship between electron spin, electromagnetism and gravity allowed any object to leave the Earth's surface.

Teleoperated Beetle Car
A remotely-operated robotic vehicle that permitted telepresence.

Teleoperated Lab Robot
A robot is used to conduct experiments in an environment too extreme for humans.

Tin Cabby (Flying Robotic Taxi) - mechacab
An autonomously controlled flying taxi cab.

Toposcope
A special helmet used in a form of sleep teaching.