IT IS MOST IMPORTANT INVENTION IN MUSIC THAT IMPROVED THE USE OF ANY BRASS INSTRUMENTS
VALVE
IT IS ONE OF THE MECHANICAL ACHIEVEMENTS THAT IMPROVED THE MODE OF TRANSPORTATION
RAILROAD
IT IS ONE OF THE IMPORTANT INVENTIONS THAT CHANGED THE WORLD
TELEPHONE
IT IS THE REVOLUTIONARY INVENTION OF THE FRENCH INVENTOR, JOSEP NIEPCE
CAMERA
THE MOST FAVORITE MUSICAL INSTRUMENT OF THE ERA
PIANO