Engraving depicting Mangin and Leroyers signalling lamp for mines. The incandescent bulb was immersed in a lantern of distilled water to minimize the chance of an explosion should the lamp break. Dated 19th century.

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Creative#:

TOP29619159

Source:

達志影像

Authorization Type:

RM

Release Information:

須由TPG 完整授權

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Not Available

Property Release:

Not Available

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No

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