Transistor radio and autoclave: what they have in common

1. Step 1. Transistor radio — has part — Loudspeaker. A loudspeaker.
2. Step 2. Loudspeaker — has part — Diaphragm. The cone diaphragm vibrates and makes sound.
3. Step 3. Diaphragm — is part of — Stethoscope. A diaphragm.
4. Step 4. Stethoscope — is used in — Blood pressure monitor. Listening for the Korotkov sounds.
5. Step 5. Blood pressure monitor — evolved from — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
6. Step 6. Manometer — is part of — Autoclave. The gauge shows whether the steam pressure in the chamber is high enough to sterilize.

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