In 1908, P. L. Robertson began to manufacture a square recess impression in the head of a screw in Milton, Ontario, Canada. At that time, it was a revolutionary change in the fastener industry. The first patent was issued in 1909 and the last patent expired 55 years later in 1964. For his invention, P.L. Robertson screws and screwdrivers carry his name to this day.
While they are now ubiquitous in North America they are yet to catch on properly here in Oz but those who use Robertson screws admire the square drive system and also the quality of the screws themselves - far outperforming those produced in Asia and found in normal hardware stores so if you want quality in every facet of the materials you use, Robertson Screws are the way to go!