PARACHUTE

RADAR

METRONOME

GYROSCOPE

KALEIDOSCOPE

PHOTOGRAPHY

PLAYER@@PIANO

BRAILLE@@PRINTING

FLOPPY@@DISK

FIBERGLASS

BARBED@@WIRE

TRANSISTOR

MICROPROCESSOR

SUBMARINE

ROCKET@@ENGINE

HELICOPTER

AIR@@CONDITIONING

BIFOCAL@@LENS

AMERICAN@@INVENTIONS