Tennis racket and programmable logic controller: what they have in common

1. Step 1. Tennis racket — is made of — Carbon fibre. Modern frames.
2. Step 2. Carbon fibre — is material for — Quadcopter (drone). The frame is carbon fibre.
3. Step 3. Quadcopter (drone) — uses — Feedback control. The flight controller holds the position.
4. Step 4. Feedback control — is used in — Industrial automation. Control.
5. Step 5. Industrial automation — uses — Programmable logic controller. Controllers.

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