T44 folding bayonet types

[kicker]

I have been looking at the 3 types on folding bayonets for the T44, but can't fine a timeline or serial number range when each was changed. Does anyone have the details of which type of setup began and ended. I build many projects from the ground up so it's important to have a sense of these things. I'd take any set up though.
thanks scott

[Deano41]

Here is a start, http://www.banzaionline.com/RifPrimer/Model44/Variations/FromEarlB.htm#Top_Earls_44s

There might be more information on that website. Then there is also "Military Rifles of Japan" by Honeycutt.