7,897,188 (March 1, 2011), W. Wilbers, assigned to Wegra Beheer B.V., Valkenswaard, The Netherlands

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A baking machine uses electrified infrared radiators arranged above a conveyor track to cook edible products. The infrared radiators each feature at least one spiral filament that has a gas-tight, infrared radiation-transmitting casing with the means to monitor breakage of the glass casings.