Military radio battery pack and paper machine: what they have in common

1. Step 1. Military radio battery pack — is part of — Military radio. Power.
2. Step 2. Military radio — uses — Cipher machine. Encryption.
3. Step 3. Cipher machine — uses — Cryptography. Encryption.
4. Step 4. Cryptography — is used in — Colossus. It broke the Lorenz cipher.
5. Step 5. Colossus — is made of — Paper. The data is on paper punched tape.
6. Step 6. Paper — uses — Paper machine. Industrial production.

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