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Amazon.com: ZEBRA GK420t Thermal Transfer Monochrome Desktop Printer Print Width of 4 in USB and Ethernet Port Connectivity GK42-102210-000 : Office Products
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ZT411 and ZT421 standard user connectivity interface for communication between printer and host. Included USB, TCPIP, RS232 and bluetooth.
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File:Overview of label printer COM and USB connector of Zebra GK420d in Michle, Prague.jpg - Wikimedia Commons
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