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WikiPedia: Pembumian elektrik http://www.du.edu/~jcalvert/tel/morse/morse.htm http://patft.uspto.gov/netacgi/nph-Parser?patentnu... http://www.st.gov.my/images/stories/upload/st/st_f... http://www.electrical-installation.org/ http://www.iee.org/Publish/WireRegs/WiringMatters/... http://www.pat2pdf.org/pat2pdf/foo.pl?number=16720... http://www.tlc-direct.co.uk/Book/5.2.1.htm