Russian T-28 Values?

[saracv3]

I'm looking at the T-28 (values here:   PG-HQ T-28 Info )  and I'm trying to figure out what these values represent.

In my edition of ASL, the T-28 has a short barrel 76mm gun nowhere near the equal of medium velocity 76mm mounted on early T-34s.

One difference is that the 76.2mm on the T-28 non-variant was that it was a howitzer vs. the AP type in the T-34. Basically, the T-28 was a 1920s era design w a WWI artillery piece as its main armament. But variants were built later that used the better AP 76.2mm. The T-28A had a 27/32 76.2mm gun, introduced in 1934. i'm assuming that was an AP gun, but i can't find info on it yet.  There is a book in Russian devoted to the 76.2mm in the Open Library. It's titled Geniii Sovetskoi artillerii by A.B Shirokorod, 2002.