1. Microphone   Benjamin Franklin   Sir Alexander Graham Bell   Fahrenheit   Rudolf Diesel   Hint Half-n-half Clue   2. Waterproof Rubber   Thomas Alva Edison   Samuel Morse   Sir Alexander Graham Bell   Charles Macintosh   Half-n-half Clue   3. Bifocal Lens   Thomas Alva Edison   Rudolf Diesel   Benjamin Franklin   John Logie Baird   Half-n-half Clue   4. Steam Engine (condenser)   Thomas Alva Edison   Sir Alexander Graham Bell   James Watt   Michael Faraday   Half-n-half Clue   5. Aeroplane   Alfred B. Nobel   Orville and Wilbur Wright   Thomas Alva Edison   Fahrenheit   Half-n-half Clue   6. Movie Projector   Elisha G. Otis   Thomas Alva Edison   Michael Faraday   James Watt   Half-n-half Clue   7. Vulcanised Rubber   Thomas Alva Edison   Benjamin Franklin   Michael Faraday   Charles Goodyear   Half-n-half Clue