Grenade fuze with pin and vacuum pump: what they have in common

1. Step 1. Grenade fuze with pin — is part of — Grenade. A delay fuse with a pin.
2. Step 2. Grenade — is made of — Clay. Medieval grenades were ceramic vessels.
3. Step 3. Clay — is material for — Bloomery. A bloomery is a clay shaft.
4. Step 4. Bloomery — has part — Bellows. Bellows blew in air for a high temperature.
5. Step 5. Bellows — has part — Check valve. An air intake valve.
6. Step 6. Check valve — is part of — Vacuum pump. Valves stop air from flowing back.

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