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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 168
Fig. 28.—Types of modern enclosing light units for gas-filled lamps. Semi-indirect system. £_tFLECToR_ … fL/OS biFfoJE-S-- ETAL IV. i eijY>bo~LLighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
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