[Pibwl]

To confuse matters, I've just found in a Russian monograph of T-26 tank (Frontline Illustration, vol.2), that there actually WERE used mine rollers during the Winter War. Unfortunately, sources are rich of photos and details of tested prototypes, but when it comes to combat-used models, information is scarce, with no photos. Seems, that it was a makeshift design, produced by two factories in Leningrad (93+49 units), developed since 12/39, probably with no connection with earlier works. They were 70-90 cm diameter discs on a common axle. Reportedly they were mounted on T-26 and T-28, given to the Army in Feb-March/40, and used with a success by the 35th Tank Bde and tank battalions of the 8th Army on Karelian Isthmus.

By the way: there didn't exist T-26 dozer tanks (unit 655). There was only tested a snowplough for T-26, but not adopted (it appeared too weak for thick snow).