- Somecopiers,mostlyolderanalogcopiers,employapositivelychargeddrumandpaper,andnegativelychargedtoner.Ican'tworkinanofficebecauseevenringingphonesandhummingphoto-copiersdoit.Printers,copiers,graphicsequipmenthavewidelyusedintoday'soffice,engineeringd...
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