Helicopter and hollerith tabulator: what they have in common

1. Step 1. Helicopter — evolved into — Tiltrotor. A helicopter that turns into an aeroplane.
2. Step 2. Tiltrotor — is made of — Carbon fibre. The blades and wing are composites.
3. Step 3. Carbon fibre — is material for — Prosthetic limb. Carbon feet.
4. Step 4. Prosthetic limb — has part — Servomotor. Bionic prostheses have motors.
5. Step 5. Servomotor — uses — Electromagnetism. A servo is an electric motor with feedback.
6. Step 6. Electromagnetism — is used in — Hollerith tabulator. The counters click with electromagnets.

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