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.
The circuit board engages the heating element (made out of mica sheets and nichrome wire).
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.
Nichrome wire is wrapped around the two mica sheets in order to produce rapid heat.
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