Abstract: A wood floor edger is disclosed herein. An embodiment of the edger comprises a housing and a motor. The housing comprises an opening and a rotatable abrasive disc located in the opening. The rotatable abrasive disc may have a diameter greater than six inches. The motor is operatively connected to the first housing and drivingly connected to the abrasive disc. A motor controller is electrically connected to the motor, wherein the motor is operatable at a speed that is preselected by the motor controller.

Abstract: A wood floor edger is disclosed herein. An embodiment of the edger comprises a housing and a motor. The housing comprises an opening and a rotatable abrasive disc located in the opening. The rotatable abrasive disc may have a diameter greater than six inches. The motor is operatively connected to the first housing and drivingly connected to the abrasive disc. A motor controller is electrically connected to the motor, wherein the motor is operatable at a speed that is preselected by the motor controller.

Abstract: The present invention includes a continuous optical fiber secured to the movable control member and a connector unit which transmits and detects a light signal at opposite ends of the optical fiber and converts the detected light signal into an electrical signal. More specifically the present invention also includes apparatus for allowing authorized movement of the control member as well as means for detecting unauthorized movement of the control member. A preferred embodiment includes an optical fiber that is adapted to be secured to a movable control member of a valve and secured at each end to respective terminals on a connector unit. The length of the loop, optical fiber, and the position of the terminals and connector until are selected so that moving the movable control member of the valve interrupts the light path provided by optical fiber between the terminals to which the ends of the fiber are attached.