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Sep 14, 2018 at 5:56 history edited NormTrotsky CC BY-SA 4.0
added 521 characters in body
Sep 13, 2018 at 12:17 comment added ObsessionWithElectricity I heard RF waves at cellular frequencies need LINE OF SIGHT. So how do they work in buildings and pass through walls?
Sep 13, 2018 at 12:04 history answered NormTrotsky CC BY-SA 4.0