Huge RARE 44" Pyrex Distillation Column Glenla Glass Engineering Laboratory

Sorry I have no idea what I’m selling here other then its a Pyrex Distillation Column. I purchased at a local estate were the previous owner was a employee of Exxon.  The piece is Marked Glass Engineering Laboratory Belmont California GLENLA & its also marked Pyrex USA 29/42 and the tubes on the side are marked with a S over 18. The piece is 44″ long and has 21 chambers with 21 tubes coming out the side of the unit. And appears to be in excellent used condition. Please see close up photos & feel free to ask questions.