Journal of the Illuminating Engineering Institute of Japan
Online ISSN : 2185-1506
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Fixing the so called “Ychu” or the “Pay-time for the Illuminatng Engineering”
Sadaaki Ogiso
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1947 Volume 31 Issue 1 Pages 20-28

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