Micrometer and rocket: what they have in common

1. Step 1. Micrometer — is used in — Interchangeable parts. Precise measurement ensures interchangeability.
2. Step 2. Interchangeable parts — is used in — Revolver. Colt used machine production of interchangeable parts.
3. Step 3. Revolver — uses — Gunpowder. Gunpowder propels the bullet.
4. Step 4. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.

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