๐”– Bobbio Scriptorium
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Recent developments in light signal for control of highspeed traffic


Publisher
Elsevier Science
Year
1915
Tongue
English
Weight
67 KB
Volume
180
Category
Article
ISSN
0016-0032

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โœฆ Synopsis


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 require six hours and the consmnption of 350 cubic feet of oxygen and 320 cubic feet of acetylene.


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