Abstract: A terminal block segment with one pair of feet for mounting on symmetrical tracks of two different widths includes a base with a central portion, two legs spaced from the central portion, and two feet. Each foot includes an inner toe and groove that is spaced from the central portion of the base for receiving an outside edge of a respective rail on a first mounting track and an outer toe and groove that is spaced further from the central portion than the first groove for receiving an outside edge of a respective rail on a second mounting track that is wider than the first mounting track. As one foot is levered off a rail with a screwdriver, various surfaces come into play on the two feet depending on the width of track and whether it is initially contacting the inner toes or the outer toes.

Abstract: Apparatus for providing a fluid pressure output signal upon receipt of fluid pressure input pulses in predetermined number. Fluid pressure isolation is provided as between input and output portions of the apparatus whereby the fluid pressure level of the output signal may be variably preselected irrespective of the pressure level of the input pulses.