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The mining companies are often faced with the requirement for bulky material transfer which is possible to realize using overhead travelling cranes. An overhead travelling crane has rectangular work space, which is characteristic for this type of crane. A part of an overhead travelling crane is also a crane crab. Crane crab movement is carried out after the double-girder crane construction and loads are displacing along the whole length of the crane. The aim of this paper is a proposal of 3D geometric model of the...