Scalpel and pneumatic tube: what they have in common

1. Step 1. Scalpel — is made of — Stainless steel. Stainless steel.
2. Step 2. Stainless steel — is material for — Water-jet propulsion. The impeller is stainless steel.
3. Step 3. Water-jet propulsion — has part — Impeller. An impeller.
4. Step 4. Impeller — is part of — Compressor. A centrifugal compressor is an impeller.
5. Step 5. Compressor — is part of — Pneumatic tube. A pressure or vacuum blower.

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