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[rajib]

Elevator---Elisha G. Otis
Electric Motor (DC)---Thomas Davenport
Electromagnet---William Sturgeon
Fountain Pen---Petrache Poenaru
Fluorine---André-Marie Ampère
Gramophone---Thomas Edison
Hydrogen---Henry Cavendish
Helicopter---Igor Sikorsky
Hovercraft---Christopher Cockerell
Hot Air Balloon---Josef & Etienne Montgolfier
Helium---Jules Janssen
Insulin---Sir Frederick Banting
Jet Engine---Hans Von Ohain
Lightning Conductor--- Benjamin Franklin
Locomotive---George Stephenson
Laser---Theodore Maiman
Light Bulb---Thomas Edison
Motorcycle---Gottlieb Daimler
Microscope---Zacharis Janssen
Microphone---Alexander Graham Bell
Machine Gun---Richard Gatling
Neon Lamp---Georges Claude
Oxygen---Joseph Priestley
Ozone---Christian Schonbein
Piano---Bartolomeo Cristofori