Leaf spring and electronic calculator: what they have in common

1. Step 1. Leaf spring — is part of — Truck. Leaf-spring suspension.
2. Step 2. Truck — has part — Air brake. Air brakes, as on trains.
3. Step 3. Air brake — evolved into — Anti-lock braking system (ABS). Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Anti-lock braking system (ABS) — has part — Microprocessor. A control unit.
5. Step 5. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.

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