Rare-earth metals and pneumatic tube: what they have in common

1. Step 1. Rare-earth metals — is material for — Nickel–metal hydride battery. The anode is a rare-earth alloy.
2. Step 2. Nickel–metal hydride battery — is made of — Nickel. The cathode is nickel hydroxide.
3. Step 3. Nickel — is material for — Gas turbine. The blades are nickel superalloys.
4. Step 4. Gas turbine — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Pneumatic tube. A pressure or vacuum blower.

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