Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive {characterised by a single substantially radial gap in which the fluid or medium consisting of small particles is arranged}
Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive {characterised by a single substantially radial gap in which the fluid or medium consisting of small particles is arranged}