A flow sensor has an inlet chamber with a first pressure sensor and an inlet port for receiving fluid, and an outlet chamber with a second pressure sensor and an outlet port. Constructed in an analyzing of elements is a data structure corresponding to the elements of the verilog-HDL source. A workpiece level indicator plate movable between an engaged position and a disengaged position may be attached to the planer to indicate contact with a workpiece. The thermocouple legs may be self-supporting or they may be supported by a thin membrane layer. The linear actuator comprises a motor driven drive rod coupled to the trolley that extends to advance the trolley along the track from a lower position to a higher position which raises the arm to push the cover open. A printed wiring board with a microstrip line structure in which signal lines are curved include wire-type grounding conductors located across an insulating layer from the signal lines, characterized in that wiring pitch of the grounding conductors is 1n of width of the signal lines.