Symbol Technologies PTC-860IM - Manual (Page 45)

Do not use a paper towel on any part of the PTC-860, including
the display.
If the PTC-860 becomes extremely dirty or if liquids, dirt, or
other foreign materials get inside the case, contact your Telxon
service representative.
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Servicing the PTC-860
Do not attempt to service the PTC. Only a trained Telxon
technician may service the PTC.
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