Woofer speaker driver and paper machine: what they have in common

1. Step 1. Woofer speaker driver — is part of — Subwoofer. A loudspeaker with a large cone.
2. Step 2. Subwoofer — is a kind of — Loudspeaker. A loudspeaker.
3. Step 3. Loudspeaker — is made of — Paper. The cone is paper.
4. Step 4. Paper — uses — Paper machine. Industrial production.

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