Incandescent gas mantle e incandescent light bulb: o que têm em comum

1. Passo 1. Incandescent gas mantle — faz parte de — Gas lamp. The Welsbach mantle glows in the flame (from the 1890s).
2. Passo 2. Gas lamp — evoluiu para — Incandescent light bulb. Electricity displaced gas lighting.

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