Tourniquet and newcomen engine: what they have in common

1. Step 1. Tourniquet — is made of — Leather. The strap of a tourniquet is leather.
2. Step 2. Leather — is material for — Piston. They were sealed with a leather cup.
3. Step 3. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.

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