Composite armour and dewar flask: what they have in common

1. Step 1. Composite armour — is part of — Tank. Multi-layer armour.
2. Step 2. Tank — has part — Periscope. Observation devices.
3. Step 3. Periscope — has part — Mirror. Mirrors or prisms.
4. Step 4. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
5. Step 5. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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