1. Logarithmic Tables   John Napier   G. Ferdinand Von Zeppelin   James Harrison, Alexander Catlin   Robert Wilhelm Von Bunsen   Hint Half-n-half Clue   2. Bakelite   Gottlieb Daimler   James Harrison, Alexander Catlin   Leo H Baekeland   Dr. William Stokes, Rene Laennec   Half-n-half Clue   3. Internal Combustion Engine   Lewis E. Waterman   Kirkpatrick Macmillan   Otto   Evangelista Torricelli   Half-n-half Clue   4. Automobiles using gasoline   John J. Loud   Bardeen, Shockley, Brattain   Karl Benz   Dr. William Stokes, Rene Laennec   Half-n-half Clue   5. Stethoscope   John J. Loud   Otto   Dr. William Stokes, Rene Laennec   Leo H Baekeland   Half-n-half Clue   6. Airship (rigid)   G. Ferdinand Von Zeppelin   Evangelista Torricelli   Gottlieb Daimler   Karl Benz   Half-n-half Clue   7. Power Loom   Edmund Cartwright   Otto   Johann Gutenberg   G. Ferdinand Von Zeppelin   Half-n-half Clue