British Standard specification for inter-nally-illuminated yellow diffusing globes for traffic control signals.
British Standard specification for inter-nally-illuminated yellow diffusing globes for traffic control signals
Brit Standards Instn -- Standard Specification -- British Standard Specifications
1934
Standard
English
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British standard specification for road traffic control (electric) light signals
Engineering Index Backfile | 1939
British Standard specification for road traffic control (electric light signals)
Engineering Index Backfile | 1933
British standard specification for road traffic control (electric) light signals. Revised Aug 1937
Engineering Index Backfile | 1937
British standard specification for road traffic control (electric) light signals. Revised Aug 1937
Engineering Index Backfile | 1937
Illuminated road traffic signals
Engineering Index Backfile | 1933
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