Marsh invented a product known as Nichrome wire, a filament that has the ability to withstand the intense heat that it takes to toast a piece of bread quickly.
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Mica sheets are used as part of the toaster's heating element by providing structure for the Nichrome wire, which is wrapped around the two sheets.
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Nichrome wire is wrapped around the two mica sheets in order to produce rapid heat.
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The circuit board engages the heating element (made out of mica sheets and nichrome wire).