T-26 (BPK)[REF][REF] (BPK stands for batal'onnaya pushka Kurchevskogo or "battalion gun by Kurchevsky"): twin-turreted version with a 76.2 mm recoilless gun (or "dynamic reaction gun", as it was called at the time) in the right turret.
One twin-turreted T-26 was given to the Research Institute of Communication in March 1932 to develop special tank communication devices.