1. Z. Janssen   Internal Combustion Engine   Airship (rigid)   Microscope   Barometer   Hint Half-n-half Clue   2. John J. Loud   Ball-Point Pen   Bicycle   Barometer   Shorthand   Half-n-half Clue   3. Sir Isaac Pitman   Shorthand   Rabies Vaccine   Stethoscope   Jet Engine   Half-n-half Clue   4. Bardeen, Shockley, Brattain   Transistor   Rabies Vaccine   Gunpowder   Bicycle   Half-n-half Clue   5. Karl Benz   Refrigerator   Automobiles using gasoline   Logarithmic Tables   Power Loom   Half-n-half Clue   6. Kirkpatrick Macmillan   Power Loom   Microscope   Bicycle   Refrigerator   Half-n-half Clue   7. Evangelista Torricelli   Printing Press   Barometer   Automobiles using gasoline   Rabies Vaccine   Half-n-half Clue