This page from a 1927 Line Material Co. catalog shows the boxer tree insulator and also the G & A tree insulators. I don't think the boxer tree insulator was a popular design because later catalogs only picture the G & A, and Hendee tree insulators. I have the porcelain part to a G & A tree insulator and have yet to aquire a Hendee tree insulator. Either way they are all neat pieces of history.