1. Robert Wilhelm Von Bunsen   Ball-Point Pen   Gunpowder   Laboratory Gas Burner   Bakelite   Hint Half-n-half Clue   2. Roger Bacon   Bakelite   Gunpowder   Rabies Vaccine   Transistor   Half-n-half Clue   3. Sir Frank Whittle   Printing Press   Refrigerator   Bakelite   Jet Engine   Half-n-half Clue   4. Gottlieb Daimler   Power Loom   Bicycle   Carburettor   Gunpowder   Half-n-half Clue   5. Johann Gutenberg   Refrigerator   Laboratory Gas Burner   Bakelite   Printing Press   Half-n-half Clue   6. Otto   Rabies Vaccine   Internal Combustion Engine   Transistor   Power Loom   Half-n-half Clue   7. John Napier   Logarithmic Tables   Shorthand   Bicycle   Printing Press   Half-n-half Clue