Harmonica reed plates and sonar: what they have in common

1. Step 1. Harmonica reed plates — is part of — Harmonica. Plates with slots for the reeds.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Bellows. Bellows.
4. Step 4. Bellows — is made of — Leather. Bellows are a leather bag.
5. Step 5. Leather — is material for — Submarine. It was covered with leather.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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