site.btaThe Balevsky-Dimov Method: a Bulgarian Invention Applied in Most Developed Countries
Certificate for the invention, Patent Office archives
The gas counter-pressure casting method is the Bulgarian invention that has perhaps found the widest application anywhere in the world, and in the most industrialized countries, BTA learned from the director of the Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre, Acad. Ivaylo Katsarov
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