The earliest documented screwdrivers were used in the late Middle Ages. They were probably invented in the late 15th century, either in Germany or France. The tool's original names in German and French were "Schraubendreher" (screwturner) and "tournevis" (turnscrew), respectively. The first documentation of the tool is in the medieval " Housebook" of Wolfegg Castle, a manuscript written sometime between 1475 and 1490. These earliest screwdrivers had pear-shaped handles and were made for slotted screws (diversification of the many types of screwdrivers did not emerge until the Gilded Age). The screwdriver remained inconspicuous, however, as evidence of its existence throughout the next 300 years is based primarily on the presence of screws.