3M Touch Screen Controller EX 111 Reference Manual page 30

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The following figures show the overall dimensions of the EX121 controller and the
locations of the mounting holes and connectors.
Figure 1 EX121 Overall Dimensions
Figure 2 Cased EX121 Touch Controller
3M Touch Systems, Inc. Proprietary Information -- 29489v05
3M™ MicroTouch™ Controller EX USB Reference Guide