1. Z. Janssen   Automobiles using gasoline   Bicycle   Microscope   Printing Press   Hint Half-n-half Clue   2. Sir Isaac Pitman   Gunpowder   Shorthand   Transistor   Laboratory Gas Burner   Half-n-half Clue   3. Edmund Cartwright   Bicycle   Logarithmic Tables   Printing Press   Power Loom   Half-n-half Clue   4. Bardeen, Shockley, Brattain   Bakelite   Power Loom   Automobiles using gasoline   Transistor   Half-n-half Clue   5. Leo H Baekeland   Bakelite   Laboratory Gas Burner   Printing Press   Power Loom   Half-n-half Clue   6. David Bushnell   Jet Engine   Submarine   Gunpowder   Barometer   Half-n-half Clue   7. G. Ferdinand Von Zeppelin   Ball-Point Pen   Electronic Computer   Transistor   Airship (rigid)   Half-n-half Clue