Rubber inflation bulb and headphones: what they have in common

1. Step 1. Rubber inflation bulb — is part of — Blood pressure monitor. It forces air in.
2. Step 2. Blood pressure monitor — uses — Stethoscope. Listening for the Korotkov sounds.
3. Step 3. Stethoscope — uses — Sound wave. It transmits sound.
4. Step 4. Sound wave — is used in — Headphones. The diaphragm creates a sound wave.

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