1. G. Ferdinand Von Zeppelin   Electronic Computer   Microscope   Submarine   Airship (rigid)   Hint Half-n-half Clue   2. Dr. William Stokes, Rene Laennec   Gunpowder   Logarithmic Tables   Electronic Computer   Stethoscope   Half-n-half Clue   3. Z. Janssen   Airship (rigid)   Microscope   Printing Press   Bakelite   Half-n-half Clue   4. Karl Benz   Power Loom   Laboratory Gas Burner   Automobiles using gasoline   Printing Press   Half-n-half Clue   5. John Napier   Bicycle   Logarithmic Tables   Refrigerator   Internal Combustion Engine   Half-n-half Clue   6. Edmund Cartwright   Carburettor   Power Loom   Jet Engine   Fountain Pen   Half-n-half Clue   7. Bardeen, Shockley, Brattain   Printing Press   Logarithmic Tables   Transistor   Submarine   Half-n-half Clue