Helmet and hydraulic press: what they have in common

1. Step 1. Helmet — is made of — Leather. Helmet liners and simple helmets were made of leather.
2. Step 2. Leather — is material for — Piston. They were sealed with a leather cup.
3. Step 3. Piston — is part of — Hydraulic cylinder. The piston is moved by liquid.
4. Step 4. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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