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.

The author’s name is Shirokorad, not Shirokorod. Sorry for the mistake. The book seems elusive to find. I was going to import it and use a transalator. I understand the engineer, Grabin, worked as part of an anonymous design team in a Leningrad munitions plant. He was maltreated by Soviet government for most of his life and this book tells the story.