What does the Bourg -P designation mean: AGR vs. AGR-P sticher, PA vs. PA-P folder

[Jeff]

What does the Bourg -P designation signify. I'm looking at a few Bourg AE setups and some have listed AGR stitcher and PA folder while others list AGR-P stitcher and PA-P folder.

 

[xpquickprint]

The Bourg AGR-P is a newer model than the AGR and the PA-P is a newer model than the PA but I can not locate specifics on what has been improved from one generation to the next. Maybe a bindery dealer will find this post and have a real answer for you.