Compression paddle and hammer: what they have in common

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

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