Very interesting and ingenious.
Articulated, I guess, so that you can get that troublesome bottom edge. :-)
They're used here as well for the first three levels of a building. Anything beyond that, they're using lifts either raising them up or lowering them down from a roof.
I see them on ladders here. You can't use any ladders?
Interesting that ladders are forbidden. Probably too many accidents. I think doing that job would give me a stiff neck!!
That is interesting that no ladders are allowed. I think I would get neck cramps.
A smaller version would be helpful for our exterior windows....must see if I can find one.
That is the longest window washing pole I have ever seen. Wow, don't know how they manage to get windows clean using this tool.