Tree Pruning Classifications?

Where can find the Standards for the classifications of types of tree pruning?

I know there use to be Like Class-1, Class-2

But, I've been told they have changed or are going to change.

Anyone know?
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A300 pruning standard from ANZI. You should be able to find it on your chapters ISA site or even the main ISA too. I think this might be what your looking for never heard of them called class 1 or class 2.
 
Pruning Classes were used in the old pruning specification.
They were put out but the NAA, with help from other organizations probably. These predated the A-300 pruning standards and were phased out.

I'm not sure of dates since I can't find my copies.
 

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