All of the company's activities in "concrete accessories", which form part of the construction business, are combined in DSI's traditional DYWIDAG form tie business with products and systems produced by the DSI companies in Porta Westfalica, contec-systems (Germany), as well as in the companies Artéon, Mandelli-Setra, Technique Béton and Idéaplast (all of them located in France).
Livio Dante Porta | Porta Westfalica | Giambattista della Porta | Milano Porta Garibaldi railway station | Antonio Porta | Verona Porta Nuova railway station | Porta Nuova | Horace François Bastien Sébastiani de La Porta | Torino Porta Nuova railway station | Rafael La Porta | Porta | Donatella della Porta | Torino Porta Susa railway station | Santa Maria alla Porta, Milan | Santa Maria alla Porta | Porta Westfalica (gorge) | Porta Ticinese | Porta Nuova (Milan) | Porta Nigra | Porta coeli Convent | Porta Coeli | Palazzo Della Porta Negroni Caffarelli | Giambattista della Porta, founder of the ''Academia Secretorum Naturae'' | 3276 Porta Coeli |
Minden Land in its narrower sense includes the towns and villages of Minden, Hille, Petershagen and the northern part of Porta Westfalica, as well as Lübbecke, Espelkamp, Preußisch Oldendorf, Rahden and Stemwede in Lübbecke Land.
Towns along the Weser, from the confluence of Werra and Fulda to the mouth, include: Hann. Münden, Beverungen, Höxter, Holzminden, Bodenwerder, Hameln, Hessisch Oldendorf, Rinteln, Vlotho, Bad Oeynhausen, Porta Westfalica, Minden, Petershagen, Nienburg, Achim, Bremen, Brake, Nordenham, Bremerhaven.
The Weser Hills cross the counties of Minden-Lübbecke, Schaumburg and Hameln-Pyrmont in a roughly east-west direction, from the town of Porta Westfalica and the Westphalian Gap in the west past Rinteln to Hessisch Oldendorf in the east, where they transition seamlessly to the Süntel, a ridge of similar height running from northwest to southeast.
Their northern section runs in an east-west direction roughly from the territory of Bramsche (northwest of Osnabrück) via Ostercappeln, Bad Essen, Preußisch Oldendorf and Rödinghausen, Lübbecke, Hüllhorst and Bad Oeynhausen as far as the towns of Minden and Porta Westfalica on the Porta Westfalica gorge and River Weser.
Middle Weser Valley, on the North German Plain, the southern part of the Weser Depression between the Porta Westfalica gap and its confluence with the Aller river.