1. Karl Benz   Logarithmic Tables   Jet Engine   Automobiles using gasoline   Bicycle   Hint Half-n-half Clue   2. Johann Gutenberg   Bakelite   Printing Press   Transistor   Jet Engine   Half-n-half Clue   3. Robert Wilhelm Von Bunsen   Laboratory Gas Burner   Logarithmic Tables   Automobiles using gasoline   Submarine   Half-n-half Clue   4. Otto   Rabies Vaccine   Bicycle   Internal Combustion Engine   Power Loom   Half-n-half Clue   5. David Bushnell   Submarine   Refrigerator   Stethoscope   Ball-Point Pen   Half-n-half Clue   6. Kirkpatrick Macmillan   Jet Engine   Automobiles using gasoline   Transistor   Bicycle   Half-n-half Clue   7. Bardeen, Shockley, Brattain   Gunpowder   Transistor   Rabies Vaccine   Jet Engine   Half-n-half Clue