Abstract: A hollow beam or post for a construction system, the beam or post comprising a core element formed of a straight hollow central element having a cross-section provided with four diametrically opposed hollow outer projections in the shape of outwardly flaring dovetails, which are arranged crosswise. Said four hollow outer projections have narrowed inner ends which are spaced apart from the narrowed inner ends of the adjacent hollow outer projections and are connected by segments of the hollow central element. Four straight hollow surrounding elements are assembled around the core element to form a square surrounding the core element, the four surrounding elements having an inner cross-sectional shape that is complementary to the four diametrically opposed outer projections of the core element.

Abstract: A method for setting the lifting position of a machine frame of a ground milling machine, which machine frame is connected via lifting means to movement means, and to a ground milling machine.

Abstract: A method for setting the lifting position of a machine frame of a ground milling machine, which machine frame is connected via lifting means to movement means, and to a ground milling machine.

Abstract: A construction system for a module of a dwelling the main elements of which are made of plastic material includes a set of hollow profiled beams (1, 1?) of elongate rectilinear shape of type 1 and of type 2. The beams (1, 1?) include at each end (5, 5?) a transverse passage opening (6, 6?). The transverse passage opening (6) of a beam (1) of type 1 comes to be nested with the transverse passage opening (6?) of a beam (1?) of type 2 when the two beams (1, 1?) are assembled end to end at a right angle leaving a passage opening (6, 6?) between the two ends (5, 5?) of the beams (1, 1?). Two beams (1) of type 1 can be assembled with two beams (1?) of type 2 to form a rectangular frame. The system further includes a set of corner assembly elements (2, 2?), each assembly element (2, 2?) including a body intended to pass through the transverse passage opening (6, 6?) of the beams (1, 1?) of type 1 and 2.

Abstract: Method for the production of phthalic acid anhydride by catalytic gas phase oxidation of o-xylol with oxygen, in which the reaction is carried out in 5 to 60 serially arranged reaction zones under adiabatic conditions, and reactor system for carrying out the method.