In 1960's I was cutting/trimming trees with Norwegians in the Laurentides of Quebec. The branch lopper we were using had a thick straight blade set within a half moon frame mounted on an axe handle. It was in the form of a 'D': a thick single edge knife like blade set into the metal 'hilt' or curve of the 'D'. This tool was more effective at trimming branches than any axe or hatchet. I have never seen this amazing tool since and do not know its name, origin or manufacture.