Brick bottom tubes and conveyor belt: what they have in common

1. Step 1. Brick bottom tubes — is part of — LEGO bricks. Hollow tubes underneath hold the brick by an elastic grip.
2. Step 2. LEGO bricks — uses — Interchangeable parts. Any brick fits any other.
3. Step 3. Interchangeable parts — is used in — Assembly line. Flow production is only possible with interchangeable parts.
4. Step 4. Assembly line — uses — Conveyor belt. The product moves between stations on a conveyor.

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