These are my thoughts I have seen curry combs that look like that although none ever had nails, also when I was a teenager I used a trash picker upper that had a square bottom with nails in it, stab the trash then remove it although I can't see where the pole would have attached to yours, unless it fit in something that encased it thus no attaching points.This was 30 yrs ago for the trash grabber now they have the tong style.Hopefully this helps in your I.D.