Glass test tube and smart meter: what they have in common

1. Step 1. Glass test tube — is part of — Test tube. A glass tube with a rounded bottom.
2. Step 2. Test tube — is made of — Glass. Glass.
3. Step 3. Glass — is material for — Polarizing filter. Between sheets of glass.
4. Step 4. Polarizing filter — is part of — Liquid-crystal display. Polarizers.
5. Step 5. Liquid-crystal display — is part of — Smart meter. A display.

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