For sale on the Martin guitar web page - parts department:

TRUSS ROD WRENCH

Handle ball driver end and extended reach length. NEW ergonomic handle and rubber tubing to protect strings


Qty. Add Price Item Number
    $7.75
USD 13TZTRAW

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Two Way Truss Rod Wrench

The two way truss rod wrench can be used on both the two way adjustable rod necks or single adjustable rod.

Qty. Add Price Item Number
    $3.65
USD 13WR0001

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So yes, some Martins have a 'two-way truss rod' whatever that may be.

They also have a list of a dozen approved Canadian luthiers. Hint, hint.