1. Bakelite   C. F. Brush   James Harrison, Alexander Catlin   Edmund Cartwright   Leo H Baekeland   Hint Half-n-half Clue   2. Printing Press   Bardeen, Shockley, Brattain   Johann Gutenberg   Z. Janssen   Roger Bacon   Half-n-half Clue   3. Microscope   Dr. William Stokes, Rene Laennec   Gottlieb Daimler   Z. Janssen   John Napier   Half-n-half Clue   4. Refrigerator   Z. Janssen   Dr. Wallace H. Carothers   James Harrison, Alexander Catlin   Bardeen, Shockley, Brattain   Half-n-half Clue   5. Airship (rigid)   Edward Jenner   G. Ferdinand Von Zeppelin   William Siemens   James Harrison, Alexander Catlin   Half-n-half Clue   6. Arc Lamp   C. F. Brush   Karl Benz   H. W. Seeley   Nikola Tesla   Half-n-half Clue   7. Laboratory Gas Burner   Robert Wilhelm Von Bunsen   Sir Isaac Pitman   Lewis E. Waterman   Dr. Wallace H. Carothers   Half-n-half Clue