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Light or illumination
Examples of savings due to good lighting; requirements of proper system; description of new Type H mercury lamps.
Light or illumination
Examples of savings due to good lighting; requirements of proper system; description of new Type H mercury lamps.
Light or illumination
Nat Safety News
Warren, D.M. (author) / Maltby, F.O. (author)
National Safety News ; 34
1936
Article (Journal)
English
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