1. Diesel Engine   Thomas Alva Edison   Elisha G. Otis   Rudolf Diesel   Orville and Wilbur Wright   Hint Half-n-half Clue   2. Bifocal Lens   Elisha G. Otis   Benjamin Franklin   Rudolf Diesel   Fahrenheit   Half-n-half Clue   3. Microphone   Elisha G. Otis   Michael Faraday   Alfred B. Nobel   Sir Alexander Graham Bell   Half-n-half Clue   4. Gramophone   Thomas Alva Edison   James Watt   John Logie Baird   Orville and Wilbur Wright   Half-n-half Clue   5. Aeroplane   Sir Alexander Graham Bell   Orville and Wilbur Wright   Benjamin Franklin   Alfred B. Nobel   Half-n-half Clue   6. Dynamite   Michael Faraday   Samuel Morse   Sir Alexander Graham Bell   Alfred B. Nobel   Half-n-half Clue   7. Elevator   Orville and Wilbur Wright   Elisha G. Otis   Charles Goodyear   John Boyd Dunlop   Half-n-half Clue