Agroshield
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I get this as the connections
The only thing that's essential on the switch is to map each input (2, 7 14) to an output in each of the switch's three states (1, off, 2). So you end up with nine 'paths', three of which (off) lead nowhere/dead end/not connected to an output.
The switch is likely to have a manufacturer's name and part number on it. Their product catalogue generally contains a full connection diagram. The reason for all the bridges is that the switch is modular, stacked up from bits of switch lego to produce a specific behaviour.