I have both a Woodzig corded polesaw, with a special chain no longer made ( I
snap them up when I find them at garage sales) that looks very much like the one
in the video, but with pole and tail attached, and a Prazi 12 inch beam cutter
that mounts in place of a circular saw blade on a wormdrive Skilsaw.  Google
both "woodzig" and "prazi saw" to see what I'm talking about.

-Greg