Abstract: A lever has a knob and an elongated part. In one of its ends, the elongated part carries the knob and is at a distance from the end connected to a mechanism that is to be operated, such as a gear box. The knob includes an electrical switch and is movable radially relative to the longitudinal axis of the lever part and has a cavity into which the lever part protrudes with one of its ends which also functions as a second contact element. The cavity has a peripheral surface which defines a space with the surface of the end of the lever part. In the space there is located an elastically deformable, ring-shaped centering element which at its outer periphery abuts against the peripheral surface of the space and at its inner periphery abuts against the surface of the lever part and a ring-shaped, electrical contact element. The contact element, which is part of the switch, is immovably connected to the knob and adapted to follow the knob in its radial movements.

Abstract: Liquid level sensor comprising a rod (2) on which a first (4) and a second (5) resistance wire are wound helically and parallel, a float (3) which is displaceable along the rod and which comprises a contact element which has a first (11) and a seond (12) contact plate, which each make contact with one of the resistance wires (4, 5) respectively, and a circuit which runs through the resistance wires and the contact element and whose resistivity varies depending on the position of hte float along the rod, in which respect the resistance wire (4) is recessed in the rod in the area in which the resistance wire (5) bears against the contact plate (12) while the resistance wire (5) is recessed in the rod in the area in which the resistance wire (4) bears against the contact plate.

Abstract: A sewing machine has an electronic control system for providing selected fancy patterns, the system including a replaceable memory store unit which plugs into a recess formed in the outer front surface of the machine.