HISTORICAL INFORMATION

The PT-91 Twardy ("hard","tough" or "resilient") 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 (Polish for Research and Development Centre for Mechanical Appliances) and is produced by the Bumar Łabędy 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.

Unlike many other T-72 upgrades the Polish Army PT-91s are upgraded using elements created almost exclusively by domestic companies (this includes new engine, fire control system and all communication system elements).