Harmonica and industrial robot: what they have in common

1. Step 1. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
2. Step 2. Accordion — has part — Bellows. Bellows.
3. Step 3. Bellows — is part of — Player piano. Pedal bellows create suction.
4. Step 4. Player piano — uses — Program control of a machine. The tune is recorded on a perforated roll.
5. Step 5. Program control of a machine — is used in — Industrial robot. The movements are recorded in a program.

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