Here's something different from Sydney, Australia. Stratti offset rock saws. Cutting out basements, for skyscrapers,etc. Other saws for different applications. Click on the link below, to see the story. http://dual-rocksaws.com/default_next.htm
That twin blade would be nice for cutting groves through frost for trenches or foundations. We did an addition to a warehouse building in the middle of the winter and all it needed was frost wall so they only needed to dig wide enough for the footings. They hired another company to come in with it's saw on a trencher and they cut the lines then we dug it out.