Ploughshare and industrial robot: what they have in common

1. Step 1. Ploughshare — is part of — Plough. It undercuts the slice of earth.
2. Step 2. Plough — uses — Horse collar. The horse collar made ploughing with horses possible.
3. Step 3. Horse collar — is made of — Leather. The collar and traces are leather.
4. Step 4. Leather — is material for — Prosthetic limb. It was attached with leather straps.
5. Step 5. Prosthetic limb — has part — Servomotor. Bionic prostheses have motors.
6. Step 6. Servomotor — is part of — Industrial robot. Servo motors drive the joints.

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