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Application filed by C H Johnson Machinery LtdfiledCriticalC H Johnson Machinery Ltd
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Publication of DK74762CpublicationCriticalpatent/DK74762C/da
Fremgangsmåde til formning og anbringelse af fremspringende materialedele, f. eks. tværgående ribber, på overfladerne af forud formede bygningssten og apparat til udøvelse af fremgangsmåden.