Shutter and rock drill: what they have in common

1. Step 1. Shutter — is part of — Camera. A shutter.
2. Step 2. Camera — is part of — Bubble chamber. Photographing the tracks.
3. Step 3. Bubble chamber — has part — Piston. It releases pressure.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.

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