1. Bifocal Lens   Thomas Alva Edison   Michael Faraday   Benjamin Franklin   John Logie Baird   Hint Half-n-half Clue   2. Safety Razor   Fahrenheit   Charles Macintosh   King C. Gillette   Benjamin Franklin   Half-n-half Clue   3. Pneumatic Tyres   John Boyd Dunlop   Charles Goodyear   Rudolf Diesel   Elisha G. Otis   Half-n-half Clue   4. Steam Engine (condenser)   Alfred B. Nobel   Fahrenheit   Thomas Alva Edison   James Watt   Half-n-half Clue   5. Transformer   Charles Goodyear   James Watt   Michael Faraday   Thomas Alva Edison   Half-n-half Clue   6. Diesel Engine   Thomas Alva Edison   Michael Faraday   King C. Gillette   Rudolf Diesel   Half-n-half Clue   7. Electric Lamp   Elisha G. Otis   Thomas Alva Edison   Benjamin Franklin   Alfred B. Nobel   Half-n-half Clue