Percussion cap and router: what they have in common

1. Step 1. Percussion cap — is part of — Cartridge. A primer in the case.
2. Step 2. Cartridge — uses — Gunpowder. The charge.
3. Step 3. Gunpowder — is used in — Anti-aircraft gun. Gunpowder propels the projectile.
4. Step 4. Anti-aircraft gun — uses — Radar. Radar guidance.
5. Step 5. Radar — has part — Antenna. An antenna emits and receives.
6. Step 6. Antenna — is part of — Router. Antennas.

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