Abstract: The invention relates to a sample book back having at least two groups, which are disposed in such a way as to be spaced apart from one another, of retaining elements for holding laminar products in a detachable manner, the holding elements of each group being connected to one another in an articulating manner.

Abstract: A photoelectric measurement head (26) for the monitoring of the cross-section of a profiled section between an extruder and a calibrating device of an extrusion press for the manufacture of plastic profiled sections (24) is provided in the region of a free head end of the measurement-head housing (30) with two light-passage openings (38, 42) for a light outlet and light inlet respectively. The light passage openings are arranged on opposite sides of a passage (40) for the profiled section. In each opening (38, 42) a light-transmitting glass cover (64, 66) is inserted. Furthermore, two heating elements (60, 62) are inserted in the measurement-head housing (30) in the region of its free head end in the direct vicinity of the glass covers (64) and (66). The heating elements are connected to a temperature-setting device which maintains the temperature of the free head end of the measurement-head housing at the temperature of the profiled section (24) at the nozzle outlet of the extruder.

Abstract: A plastic tab for labeling hanging files and folders provided with slots along the upper edges thereof, comprises a U-shaped label section, a flap extension section connected to the U-shaped label section and which abuts the outer face of one of the flaps, and a tongue extending from the flap extension section and inclined out of the plane thereof so as to engage the edge of a slot in the hanging folder.