Invention Grant
US08690464B2 Marker for optical mark response forms 有权
光学标记响应表格的标记

Marker for optical mark response forms
Abstract:
A writing instrument is disclosed that can enhance the speed and accuracy for a respondent using an optical machine response form. This writing instrument includes at least two reservoirs for dispensing two independent fluids with different optical reflectivity, whereby an application of the second fluid on top of a layer marked with the first fluid of the response form, modifies the digital response from the optical machine.
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