1. Fountain Pen   John J. Loud   Lewis E. Waterman   G. Ferdinand Von Zeppelin   Louis Pasteur   Hint Half-n-half Clue   2. Ball-Point Pen   Sir Isaac Pitman   Lewis E. Waterman   Bardeen, Shockley, Brattain   John J. Loud   Half-n-half Clue   3. Automobiles using gasoline   Roger Bacon   Kirkpatrick Macmillan   Evangelista Torricelli   Karl Benz   Half-n-half Clue   4. Transistor   Bardeen, Shockley, Brattain   Gottlieb Daimler   Dr. William Stokes, Rene Laennec   Sir Isaac Pitman   Half-n-half Clue   5. Refrigerator   David Bushnell   James Harrison, Alexander Catlin   Leo H Baekeland   Sir Frank Whittle   Half-n-half Clue   6. Stethoscope   Kirkpatrick Macmillan   Dr. Alan M. Turing   Evangelista Torricelli   Dr. William Stokes, Rene Laennec   Half-n-half Clue   7. Barometer   Edmund Cartwright   Evangelista Torricelli   Robert Wilhelm Von Bunsen   Sir Frank Whittle   Half-n-half Clue