Exhalation valve and rock drill: what they have in common

1. Step 1. Exhalation valve — is part of — Respirator. It makes exhaling easier.
2. Step 2. Respirator — is made of — Vulcanized rubber. The mask is rubber.
3. Step 3. Vulcanized rubber — is material for — Inner tube. Rubber.
4. Step 4. Inner tube — uses — Compressed air. Air.
5. Step 5. Compressed air — is used in — Rock drill. Pneumatics.

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