I am trying to find the name (nomenclature) of the linkage (or carriage) that is being driven by the dual linear servo (actuator) arrangement in the attached Youtube videos. The linkage (carriage) appears to be able to rotate about a 180 degree arc. What is this metal linkage (or carriage) system called? Where can someone purchase this type of linkage (carriage)? Thank you. nathanlouisgordon@gmail.com

https://www.youtube.com/watch?v=Le9hyRdcnOg

https://www.youtube.com/watch?v=P1kTsvfH2ss