CARE AND USE OF A PERMISSIBLE FLAME SAFETY LAMP, THE
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Portrays a brief history and early use of the flame safety lamp, a device used for detecting the presence of methane gas and oxygen deficiency in underground mines, in addition, explains the construction of the lamp and how it works.
Sources
- usgov-av-1974 — title, year, creator, length, color, sound, description
Record added 2026-07-01 03:45:36