A mobile device is provided having a printhead for printing onto a print medium, a media path for directing the print medium past the printhead for printing, an optical sensor, a first optical pathway for directing first optical image information to the optical sensor from print medium within an area of the media path, and a second optical pathway for directing second optical image information to the optical sensor from print medium within an area external to the mobile device.

 
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> Drilling at a resonant frequency

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