British Standard Specifications for 4 Volt Miners' Handlamp Bulbs. (see also Colliery Guardian v 148 n 3819 Mar 9 1934 p 446-7)
British standard specifications for 4 volt miners' handlamp bulbs
Brit Standards Instn-Standard Specifications
1934
22 pages
Standard
Englisch
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British standard specification for miners' lamp bulbs. (Revised Apr 1938.)
Engineering Index Backfile | 1938
British standard specification for miners' lamp bulbs. (Revised Apr 1938.)
Engineering Index Backfile | 1938
Engineering Index Backfile | 1930
Engineering Index Backfile | 1941
British Standard Specifications
Emerald Group Publishing | 1938