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This tool is a shingle scraper. It is basically a flat-blade shovel with some big teeth. There is a triangular "heel" welded to the bottom, which acts like a ramp to pivot the scraper against and lift the shingles from the roof.
The scraper is simply pushed under the shingles and lifted. This tool does a decent job of prying up the roofing nails as well.
It was once common practice in Michigan to attach galvanized steel sheets to the lower surface of residential roofs. Presumably this lets snow and ice just slip right off, reducing the chances of ice dams and roof leaks when the snow begins to melt. The reality is... the snow and ice don't slip off.
It took about an hour to scrape the shingles from one side, with 4 people working. But there were still lots of tiny pieces of shingle stuck to the wood, and many roofing nails that needed to be removed or pounded down.