1. Gunpowder   Bardeen, Shockley, Brattain   Karl Benz   David Bushnell   Roger Bacon   Hint Half-n-half Clue   2. Carburettor   Bardeen, Shockley, Brattain   Dr. William Stokes, Rene Laennec   Otto   Gottlieb Daimler   Half-n-half Clue   3. Jet Engine   Sir Frank Whittle   Dr. William Stokes, Rene Laennec   G. Ferdinand Von Zeppelin   Robert Wilhelm Von Bunsen   Half-n-half Clue   4. Electronic Computer   Lewis E. Waterman   G. Ferdinand Von Zeppelin   Dr. Alan M. Turing   John Napier   Half-n-half Clue   5. Fountain Pen   Gottlieb Daimler   Edmund Cartwright   Robert Wilhelm Von Bunsen   Lewis E. Waterman   Half-n-half Clue   6. Transistor   Johann Gutenberg   John Napier   Gottlieb Daimler   Bardeen, Shockley, Brattain   Half-n-half Clue   7. Stethoscope   Dr. William Stokes, Rene Laennec   Kirkpatrick Macmillan   David Bushnell   Bardeen, Shockley, Brattain   Half-n-half Clue