| 摘要 |
PROBLEM TO BE SOLVED: To completely prevent kinds of worms from invading. SOLUTION: In an illumination instrument directly attached to a ceiling, a colorlessly and transparently controlled biological pest control material A of compound of pyrethroid system with vapor pressure below 1×10-5 mmHg (contact type) and with a worm avoiding effect is applied to an outer surface of a light-permeating cover 3 by printing.
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