Abstract: A fitting assembly for a window or door includes a leaf tiltable and detachable from, and slidable parallel to, the fixed window or door frame, and a control element with a fastener mountable permanently on the frame and an insertion part pivotable and slidable relative to the fastener. In an insertion position, in which a control pin is pushable into the insertion part, an insertion part end section lies preferably partially against the fastener for conducting away control pin-insertion part impact into the fastener via the end section. The insertion part may pivot out of interlocking engagement with the fastener by a control arm on which the control pin may be located or formed, such that subsequently the insertion part can slide via the control pin. The control element can have a freewheel mechanism for pivoting the insertion part only during fitting assembly opening and not during closing.

Abstract: A fitting assembly for a window or door includes a leaf tiltable and detachable from, and slidable parallel to, the fixed window or door frame, and a control element with a fastener mountable permanently on the frame and an insertion part pivotable and slidable relative to the fastener. In an insertion position, in which a control pin is pushable into the insertion part, an insertion part end section lies preferably partially against the fastener for conducting away control pin-insertion part impact into the fastener via the end section. The insertion part may pivot out of interlocking engagement with the fastener by a control arm on which the control pin may be located or formed, such that subsequently the insertion part can slide via the control pin. The control element can have a freewheel mechanism for pivoting the insertion part only during fitting assembly opening and not during closing.

Abstract: An electrostatic filter cable for an electrostatic filter system includes an internal electrical conductor formed of an electrically conductive plastic with a specific resistance in a range of substantially from 2 to 200 .OMEGA. mm.sup.2 /m. An insulation of cross-linked polyethylene is disposed on the internal electrical conductor. An outer conductive layer is disposed on the insulation. A copper shield is disposed on the outer conductive layer. An outer PVC jacket is disposed on the copper shield.

Abstract: This invention relates to a process of producing magnesia from magnesium-containing carbonate ores, which comprises leaching with sulfuric acid, subsequently neutralizing the solution with magnesia, separating the undissolved impurities, crystallizing magnesium sulfate under pressure and above 150.degree. C so the crystals have from 1.5 to 4 moles of water per magnesium sulfate molecule and thermally decomposing the latter to form magnesia and SO.sub.2, recovering sulfuric acid from the sulfur dioxide produced in the decomposing steps and recycling the sulfuric acid to the leaching stage.