1. Printing Press   Dr. Alan M. Turing   John J. Loud   Gottlieb Daimler   Johann Gutenberg   Hint Half-n-half Clue   2. Internal Combustion Engine   Gottlieb Daimler   Sir Frank Whittle   Otto   Karl Benz   Half-n-half Clue   3. Transistor   Gottlieb Daimler   Kirkpatrick Macmillan   G. Ferdinand Von Zeppelin   Bardeen, Shockley, Brattain   Half-n-half Clue   4. Stethoscope   Dr. Alan M. Turing   Kirkpatrick Macmillan   G. Ferdinand Von Zeppelin   Dr. William Stokes, Rene Laennec   Half-n-half Clue   5. Ball-Point Pen   Bardeen, Shockley, Brattain   Johann Gutenberg   John Napier   John J. Loud   Half-n-half Clue   6. Laboratory Gas Burner   Robert Wilhelm Von Bunsen   Dr. Alan M. Turing   G. Ferdinand Von Zeppelin   David Bushnell   Half-n-half Clue   7. Jet Engine   Sir Frank Whittle   Otto   Louis Pasteur   Dr. Alan M. Turing   Half-n-half Clue