Just Curious: Truss Rod Design

[Hugendubel]

Does anybody know the kind of truss rod built into the necks of Larrivée guitars ? I read a lot about different designs and by now know that there are

1.
a] one-way rods, bendig the neck back if shortened and
b] two-way truss rods, bending back or forth deending upon the direction the nut is turned,

2.
a] truss rods that are one rod only, apparently being the same as 1.a] and
b] truss rod units that have two rods - those may be but mustn't be the same as 1.b]

looking like this

or this

or this
http://www.bourgeoisguitars.com/images/Fea...uss%2520Rod.jpg
or this

or this

or this one.
http://www.frets.com/FRETSPages/Luthier/Da...Views/2way2.jpg

[unclrob]

they use a single action truss rod.