Hearing Aid
Airplane
Electric Fan
Defibrillator
Camera
Telephone
Air Conditioner
Artificial Heart
Integrated Circuit
Bifocals
Optical Fiber
Microwave Oven
Water Tower
Calculator
Polio Vaccine
Space Shuttle
Nylon
Revolver
Laser
Coffee Pot
Sewing Machine
Burglar Alarm
Internet
Nuclear Submarine
Roller Skates