Specifications cover standards and definitions, requirements, testing, and tables of rating, etc.
Miners' handlamp bulbs
Brit. Eng. Standards Assn. -- Standard Specification
1930
18 pages
Standard
English
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British standard specifications for 4 volt miners' handlamp bulbs
Engineering Index Backfile | 1934
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