We call them spade grousers here.Just different terminology.We don't drink soda,we drink tonic.Although,that is changing.I now hear it referred to as soda in stores.I had a 53 Farmall H on steel with those spades.When the town was tearing up about 300 feet of pavement in front of my driveway they were peeling it up with a bucket.I took my H out and ran up and down a few times,it scarified and pulverized the old pavement pretty good.Then they loaded it up like gravel.