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1.
Telegraph or Steamboat?
2.
Telescope or the Revolver?
3.
Vending Machines or Flame Throwers?
4.
First modern General Anesthetic or The the canning process for food
The canning process for food
✓
5.
Eye Glasses or Buttons?
6.
Calculator or Carbonated Water?
7.
Plywood or The Cotton Gin?
9.
Bond Trading or The Printing Press?
10.
Morse Code or the Lawn Mower?
11.
Gunpowder or The Camera?
12.
Degree-granting University or the Ambulance?
Degree-granting university
✓
13.
Smallpox Vaccine or Morphine?
14.
Sewing Machine or Hot Air Balloon?
15.
Cable Suspension Bridge or Oil Wells?
Cable Suspension Bridge
✓
16.
Porcelain or Fireworks?
20.
Windmill or Toilet Paper?
I'd go for chess before printing.