Bakelite and sonar: what they have in common

1. Step 1. Bakelite — is material for — Telephone. The body of classic telephones is Bakelite.
2. Step 2. Telephone — has part — Microphone. The handset microphone turns the voice into an electrical signal.
3. Step 3. Microphone — includes — Hydrophone. An underwater microphone.
4. Step 4. Hydrophone — is part of — Sonar. The receiver.

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