1. Otto von Guericke   Air Pump   Arc Lamp   Logarithmic Tables   Automobiles using gasoline   Hint Half-n-half Clue   2. John Napier   Vaccination   Refrigerator   Bicycle   Logarithmic Tables   Half-n-half Clue   3. C. F. Brush   Electric Flat Iron   Air Pump   Arc Lamp   Nylon   Half-n-half Clue   4. Nikola Tesla   Automobiles using gasoline   Electric Motor (AC)   Fountain Pen   Internal Combustion Engine   Half-n-half Clue   5. Z. Janssen   Gunpowder   Microscope   Barometer   Ball-Point Pen   Half-n-half Clue   6. William Siemens   Electric Furnace   Microscope   Refrigerator   Air Pump   Half-n-half Clue   7. G. Ferdinand Von Zeppelin   Rabies Vaccine   Airship (rigid)   Electric Motor (AC)   Barometer   Half-n-half Clue