CSME Multi Launch Rockets

[Sean]

I was reading through the OOBs for some ideas for my tabletop wargaming.
They are very nicely done and informative.

I came across the 
Platoon 23.oob
This is for Egypt.

I was interested in the Rocket Artillery information.
I found the "BM-21 Grad 122mm MRL" and was confused by the operational years - 
"52 1 85 12".
Is this correct ,did they become available in 1952?
I thought it was released in 1963 from wikipedia page.

Also I was looking through the 
weapons.pdt and the line for the BM-21
and thought maybe it might of had longer range?

I compared the BM-14,BM-24 and BM-21.
No expert but I thought the longest ranged of these 3 was the BM-24 and the weapons.pdt suggests the BM-24.
Is there a chance these weapons are maybe mixed up in the OOB?Then maybe the dates of 1952 and 1961 for these weapons is close to what I thought they were? Considering it looks like USSR supplied Egypt with these weapons straight off the production line?

Bit pedantic question ,but I wanted an accurate date and weapon range for my tabletop adaption.