Sintering and r-7 rocket: what they have in common

1. Step 1. Sintering — uses — Kiln. An oven.
2. Step 2. Kiln — uses — Combustion. Heat comes from burning fuel.
3. Step 3. Combustion — uses — Oxygen. It needs oxygen.
4. Step 4. Oxygen — is material for — R-7 rocket. The oxidizer is liquid oxygen.

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