1752 Benjamin Franklin invents the Lightning rod. The Lightning rod is an important invention because it attracts the Lightning so it doesn't hit the building it's on.
1835 mechanical calculator is invented. The mechanical calculator is an important invention because it helps people do math faster and makes a lot f things go faster such as checking out at the store.
1846 Elias Howe invents sewing machine. This is an important invention because it lets people not have to make their own clothes, the work goes faster, and it lets clothes be mass produced.
1870 Louis Pasteur develops vaccines. Vaccines are an important invention because it helps prevent diseases and the spread of them. It also helps people live longer because they don't get sick as often and helps their immune system.
1876 Alexander Graham Bell patents the telephone. The telephone is an important invention because it makes it helps make things easier. Without the telephone we wouldn't have cell phones or iPads and we wouldn't be able to do a lot of the things we do today such as text someone.