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A comment on LEDs may cause retinal toxicity at occupational domestic illuminance. Parent comment

Re:LEDs may cause retinal toxicity at occupational domestic ... by Freestyler_3 on Friday January 06, 2017 @05:19PM (#13340829)
Maybe this helps

http://ecmweb.com/code-basics/grounding-and-bonding-part-2-3

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