I am about to purchase the TC 3G, but I have some principal questions regarding these series.

What is the difference between:
1. Torq-Cut TC 3G
2. Torq-Cut TC 2G
3. Torq-Cut TC 22
There is not much info on the net about the 3G and I wonder is it still supported with spares and why is the TC 22 so much more common.

The VMC I'm talking about is a 98 year model and comes with the standard Heidenhain control, it is in a good full working condition.

If this has been discussed before, please give me a link to the thread as I did not find any meaningful info about the TC 3G

Once again... what is the main difference between TC 3G and TC 22???

This is the picture of the machine: