𝔖 Bobbio Scriptorium
✦   LIBER   ✦

CIE Report on Light Signals for Road Traffic Control


Book ID
112067654
Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
198 KB
Volume
6
Category
Article
ISSN
0361-2317

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Recent developments in light signal for
πŸ“‚ Article πŸ“… 1915 πŸ› Elsevier Science 🌐 English βš– 67 KB

CURRENT TOPICS. 637 ipated for them in the building of safes. Not only are the plates so extremely hard that they cannot be drilled, but they have a remarkable resistance to the flame of an oxyacetylene lamp. It is estimated that to burn a hole three inches in diameter and 3~ inch thick would requir