The PT-91 Twardy is a Polish main battle tank. It is a development of the T-72M1 and first entered service in 1995. The PT-91 was designed at the OBRUM (OBRUM for O?rodek Badawczo-Rozwojowy Urz?dze? Mechanicznych – Polish for Research and Development Centre for Mechanical Appliances) and is produced by the Bumar ?ab?dy company - part of Polish military consortium - Bumar Group. Changes from the T-72 include a new dual-axis stabilized fire-control system, reactive armour, a more powerful engine, transmission and new automatic loader.

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