1. Leo H Baekeland   Bakelite   Automobiles using gasoline   Carburettor   Arc Lamp   Hint Half-n-half Clue   2. Lewis E. Waterman   Hovercraft   Fountain Pen   Electric Motor (AC)   Bicycle   Half-n-half Clue   3. Kirkpatrick Macmillan   Shorthand   Ball-Point Pen   Bicycle   Transistor   Half-n-half Clue   4. Z. Janssen   Submarine   Fountain Pen   Microscope   Electric Furnace   Half-n-half Clue   5. Bardeen, Shockley, Brattain   Transistor   Fountain Pen   Logarithmic Tables   Internal Combustion Engine   Half-n-half Clue   6. C. F. Brush   Jet Engine   Logarithmic Tables   Arc Lamp   Automobiles using gasoline   Half-n-half Clue   7. Edward Jenner   Printing Press   Electronic Computer   Vaccination   Stethoscope   Half-n-half Clue