Amplifier and sonar: what they have in common

1. Step 1. Amplifier — is part of — Radio. Amplifying a weak signal.
2. Step 2. Radio — is part of — Sonobuoy. A radio transmitter.
3. Step 3. Sonobuoy — has part — Hydrophone. A hydrophone.
4. Step 4. Hydrophone — is part of — Sonar. The receiver.

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