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RD Supekar 12th Computer Science Textbook PDF Download | Handy Notes
Download 12th Question Bank With Solutions
RD Supekar 11th Computer Science Textbook PDF Download | Handy Notes
Tungsten Filament
Neon Lamp
Turbocharge
Valve Diode
Contact Lenses
Answering Machine
Automatic Transmission ( 1904 ) | Sturtevant renders gear sticks superfluous
Tea Bag ( 1903 ) | Sullivan accidentally discovers a way to brew an instant cup of tea
AC Electric Power (1888) | Tesla delivers cheaper, more reliable electricity
Powered Airplane ( 1903 ) | The Wright brothers build the first winged aircraft capable of sustained flight
Electricity Meter (1888) | Shallenberger's meter supplies AC power
Glass Bottle-making Machine ( 1903 ) | Owens invention does more to eliminate child labor than previous legislative efforts