Abstract: A ringing cadence filtering apparatus, which controllably prevents a subscriber device receiving ringing signals other than those having a prescribed cadence, is interposed betweeen a telephone line and a line device that has been assigned one of the telephone numbers of a multi-cadence service. It includes a controlled switching circuit through which a communication path between the telephone line and the line device connection port is normally interrupted. When a rining signal is present on the telephone line, whether or not the interruption is terminated and a path provided through the apparatus will depend upon whether the ringing cadence is that of the telephone number of the line device. To effect this determination, the telephone line input port is coupled to a plurality of ringing signal cadence detection circuits, each of which is responsive to a respectively different ringing cadence.

Abstract: An automatic ice maker structure having a water valve and rotary switch for controlling operation of the water valve. A manually adjustable switch contact structure is associated with the rotary switch for varying the time of operation of the water valve and thereby adjusting the size of ice bodies produced in the ice maker. The switch contact structure includes a support supporting the contact for reciprocal rectilinear positioning. The support has a thread engagement portion and a screw is provided having a shank threadedly engaging the portion of the support. A control knob is rotatively mounted on a wall of the housing of the control. The control knob is connected to a noncircular end portion of the screw for rotatively fixed, axially movable association therewith. The control knob is snap-fitted to the housing wall to engage the screw end. The control knob is rotatable over approximately 350.degree. to effect a corresponding range of rectilinear reciprocation of the contact.