Gamma Knife and rolling mill: what they have in common

1. Step 1. Gamma Knife — is made of — Cobalt. The sources are cobalt-60.
2. Step 2. Cobalt — is material for — Hard disk drive. The magnetic layer is a cobalt alloy.
3. Step 3. Hard disk drive — has part — Electric motor. A spindle motor.
4. Step 4. Electric motor — is part of — Rolling mill. The drive.

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