Shield boss and piston pump: what they have in common

1. Step 1. Shield boss — is part of — Shield. A metal plate above the handle.
2. Step 2. Shield — is made of — Leather. Leather on a wooden base.
3. Step 3. Leather — is material for — Fire pump. The hoses were sewn from leather.
4. Step 4. Fire pump — has part — Piston pump. A fire pump is a piston pump.

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