Separate condenser and sickle: what they have in common

1. Step 1. Separate condenser — is part of — Watt steam engine. Watt’s main invention.
2. Step 2. Watt steam engine — is part of — Grain elevator. Dart’s first elevator was steam-driven.
3. Step 3. Grain elevator — uses — Grain. It stores and transfers grain.
4. Step 4. Grain — is used in — Sickle. Cereals were reaped with a sickle.

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