Explosion-proof lantern from the SOVIET UNDERGROUND BUNKER. Full video of the restoration. USSR 1970

Full video for funs of restoration :D A real military artifact of the past - an explosion-proof lantern from a Soviet military bunker. Presumably 1970.
They were used both on military aboveground or buried objects, and in hazardous industries.
The case is completely metal. Special borosilicate glass withstands a temperature range from-80ºC to 525ºC and has an increased hardness.

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Tools I use:
1. Nylon Cup for grinding and polishing.
One piece:
https://s.click.aliexpress.com/e/_eMPTTa
A set of nozzles of different shapes:
https://s.click.aliexpress.com/e/_eM95es
2. Multifunctional machine with flexible drive:
https://s.click.aliexpress.com/e/_eO6ibA
3. 220 or 110 volt Soldering station:
https://s.click.aliexpress.com/e/_ePOcK8

Видео Explosion-proof lantern from the SOVIET UNDERGROUND BUNKER. Full video of the restoration. USSR 1970 канала RustyRussian