Cinema and steam locomotive: what they have in common

1. Step 1. Cinema — uses — Cinématographe. Cinema began with the cinématographe.
2. Step 2. Cinématographe — has part — Crank. The film was advanced by turning a handle.
3. Step 3. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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