Abstract: A computer-based apparatus provides access to complex technical information needed, for example, to maintain and repair complicated equipment, such as a motor vehicle. The apparatus includes a processor unit and a selectively detachable remotely operated interactive display for accessing information from the processor unit and displaying the information, as well as controlling the functions of the processor unit. The processor unit and display unit communicate over a bi-directional communications cable or, alternatively, over a wireless communication link.

Abstract: An ultrasonic transducer probe having a sealed rotor housing, a plurality of transducers mounted on a rotor disposed in said housing. A rotor shaft mounts the rotor and extends through the housing. A drive assembly including commutating and position indicating means receives said housing and rotor shaft and serves to drive the rotor, commutate electrical energy to and from said transducers and indicate the angular position of said rotor. A handle including means for driving said drive assembly is attached to said drive assembly to position the rotor housing and drive assembly against the body the rotate said rotor to cause the transducers to scan a sector of the body.