1. Telephone   John Logie Baird   Sir Alexander Graham Bell   Rudolf Diesel   Orville and Wilbur Wright   Hint Half-n-half Clue   2. Mercury Thermometer   Fahrenheit   Benjamin Franklin   James Watt   Elisha G. Otis   Half-n-half Clue   3. Safety Razor   Benjamin Franklin   Sir Alexander Graham Bell   King C. Gillette   Charles Macintosh   Half-n-half Clue   4. Waterproof Rubber   James Watt   John Boyd Dunlop   Charles Goodyear   Charles Macintosh   Half-n-half Clue   5. Microphone   Sir Alexander Graham Bell   John Boyd Dunlop   Charles Macintosh   Thomas Alva Edison   Half-n-half Clue   6. Electric Lamp   John Boyd Dunlop   Fahrenheit   Benjamin Franklin   Thomas Alva Edison   Half-n-half Clue   7. Steam Engine (condenser)   Alfred B. Nobel   Samuel Morse   James Watt   Michael Faraday   Half-n-half Clue