Abstract: A pushbutton keyboard system comprising an electrically insulative substrate, a plurality of actuating elements or disks arranged in an array of columns and rows on one face of the substrate, and a plurality of conductors on this one face of the substrate with the conductors being parallel to one another and extending in the direction of the columns. There is one conductor for each row of elements and one conductor for each column of elements with each respective column conductor being disposed between the substrate and the elements of its respective column. Each of the conductors is a wire of generally round cross-section. The elements in each of the rows are electrically connected to their respective row conductor, whereby upon moving any one of the elements to its overcentered actuated position, a circuit is completed between the column conductor and the row conductor of the actuated element.

Abstract: Thermostatic control apparatus comprising a switch, a switch body housing the switch, and an actuator arm extending from the switch body with the arm being movable between the first and second positions for opening and closing the switch. A thermostatic bimetal strip is spaced from the switch body, with one end of the strip being mechanically linked to the actuator arm. A support extends from the body for supporting the other end of the strip. A selectively operable adjustment cam engages the strip between its ends on the face of the strip adjacent the body, this cam being operable for adjusting the thermostatic strip to open and close the switch at various preselected temperatures. A spring biases the strip into engagement with the cam whereby changes in temperature of the strip cause the arm to move between its first and second positions thereby causing the switch to open and close.