Epoxy on axe heads?

[ScottinAK]

Does anyone know when manufacturers started using epoxy to fasten axe heads instead of 2 wedges? I know Norland used it alot. I found an old wetterlings marked saw that was epoxied. I don't know if that was factory doing or previous owner. I'm really just trying to date the head.

 

[ANewSawyer]

Ask on bladeforums in the Axe forum. They could tell you.