A technology building set that is not LEGO Technic, K'NEX, or Meccano. Can you help me with the name? I remember a building/technology set from years ago and I'm trying to recall its name.
The parts were plastic and could be joined by slots down their sides. A stud on the end of other pieces fitted into the slot and could slide along.
The set also had pneumatic components.
Here is a sketch of my best memory of a typical brick.

Can you name it for me?
Based on your description, this sounds like Fischertechnik: