1. Bifocal Lens   Michael Faraday   Sir Alexander Graham Bell   Benjamin Franklin   Rudolf Diesel   Hint Half-n-half Clue   2. Vulcanised Rubber   Benjamin Franklin   Michael Faraday   Charles Goodyear   James Watt   Half-n-half Clue   3. Transformer   King C. Gillette   Michael Faraday   Benjamin Franklin   Sir Alexander Graham Bell   Half-n-half Clue   4. Telephone   James Watt   Alfred B. Nobel   Michael Faraday   Sir Alexander Graham Bell   Half-n-half Clue   5. Electric Lamp   King C. Gillette   Sir Alexander Graham Bell   Thomas Alva Edison   Michael Faraday   Half-n-half Clue   6. Steam Engine (condenser)   Thomas Alva Edison   King C. Gillette   James Watt   Charles Goodyear   Half-n-half Clue   7. Elevator   Thomas Alva Edison   John Boyd Dunlop   Charles Goodyear   Elisha G. Otis   Half-n-half Clue