Vernier caliper and steam locomotive: what they have in common

1. Step 1. Vernier caliper — is made of — Stainless steel. Stainless steel.
2. Step 2. Stainless steel — is material for — Egg beater. A whisk is stainless steel so it does not rust.
3. Step 3. Egg beater — has part — Crank. A handle.
4. Step 4. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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