Flame trench e hollerith tabulator: o que têm em comum

1. Passo 1. Flame trench — faz parte de — Launch complex. A pit that carries away the hot gases.
2. Passo 2. Launch complex — utiliza — Rocket. Launching rockets.
3. Passo 3. Rocket — é feito de — Paper. The first rockets were paper tubes filled with gunpowder.
4. Passo 4. Paper — é material para — Punched card. Punched cards are stiff card.
5. Passo 5. Punched card — é utilizado em — Hollerith tabulator. The 1890 census data was encoded on punched cards.

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