Compression paddle e hammer: o que têm em comum

1. Passo 1. Compression paddle — faz parte de — Mammograph. It spreads the cloth in a thin layer.
2. Passo 2. Mammograph — é feito de — Tungsten. The tube anode is molybdenum or tungsten.
3. Passo 3. Tungsten — é material para — Incandescent light bulb. A tungsten filament (since 1904–1910).
4. Passo 4. Incandescent light bulb — evoluiu de — Oil lamp. The electric lamp replaced oil and gas lamps.
5. Passo 5. Oil lamp — é feito de — Stone. The first lamps were stone bowls (Lascaux).
6. Passo 6. Stone — é material para — Hammer. The first hammer was a hammerstone, later mounted on a handle.

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