sentences:  When Fein's patent expired in October 2008 other tool makers started creating similar products, such as the Dremel Multi-Max, Bosch PS50 Multi-X, Rockwell Sonicraft, and Proxxon Delta Sander.The MultiMaster oscillates at 200–350 Hz (11,000–20,000 oscillations per minute).During the oscillating action, the fitted accessory moves along a minimal arc of 3.2 angular degrees.