The wall plug for attaching e.g. plasterboard (2) to old masonry (3) has arms (5) at the top which are spread when the screw (1) is tightened. These support the board and compensate for unevenness in the wall.HAASE, JOCHEN
1.A process for protecting plasterboard comprising a) a gypsum core and b) at least one paper or cardboard outer layer surrounding said gypsum core, from attack and/or destruction by micro-organisms, comprising the steps of:contacting said plasterboard and/or its components with o-phenylphenol ...
A linear structured heat exchanger (3) is arranged in an air duct of the receiver, made of ceramics and insulated by a temperature-stable insulating jacket. Ventilators are sectionally arranged in the air duct for moving hot air, where the solar-thermally produced hot air is mixed with ...