1. Steam Engine (condenser)   James Watt   Thomas Alva Edison   Charles Goodyear   Samuel Morse   Hint Half-n-half Clue   2. Pneumatic Tyres   Sir Alexander Graham Bell   Orville and Wilbur Wright   John Boyd Dunlop   Thomas Alva Edison   Half-n-half Clue   3. Transformer   Michael Faraday   Benjamin Franklin   Fahrenheit   Elisha G. Otis   Half-n-half Clue   4. Elevator   Charles Goodyear   Elisha G. Otis   Thomas Alva Edison   King C. Gillette   Half-n-half Clue   5. Safety Razor   Thomas Alva Edison   Sir Alexander Graham Bell   Fahrenheit   King C. Gillette   Half-n-half Clue   6. Telegraph Code   Charles Macintosh   Benjamin Franklin   Samuel Morse   Thomas Alva Edison   Half-n-half Clue   7. Gramophone   Thomas Alva Edison   Fahrenheit   Charles Goodyear   Sir Alexander Graham Bell   Half-n-half Clue