Mar 18 1927 n 3455 p 624-625: Selection of bulbs. Mar 25 1927 n 3456 p 681-683: Improvement of all-round luminous intensity by means of reflectors.
The improvement of miners' electric lamps
Colliery Guardian
Colliery Guardian ; 133 , n 3455-3456
1927
8 Figs.
Article (Journal)
English
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