Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fritz Dipl Ing HamannfiledCriticalFritz Dipl Ing Hamann
Application grantedgrantedCritical
Publication of AT177117BpublicationCriticalpatent/AT177117B/en
Process for the treatment of bentonite for molding sands, molding compounds u. Like. As well as molding sands, molding compounds and the like produced with this bentonite. like
Method for the production of, in particular horizontal, for receiving pipes or the like. Specific earth boreholes and drilling equipment for this purpose