Abstract: A headphone having ear pieces joined by a head band with an electrical cable interconnecting the ear pieces, including a first plurality of outward opening grooves in the head band and a second plurality of inward opening grooves in the head band, with the first and second grooves alternately positioned along the head band defining a path for the electrical cable between the ear pieces. Preferably the grooves are formed integrally with the head band, with the portions of the head band forming the grooves projecting from the head band with the grooves in alignment with each other. The headphone may also include a comfort sling underlying the head band and connected at each end to the head band.

Abstract: Disclosed herein are vehicle control devices and methods including a signal processor responsive to a signal proportional to dynamo speed and a second signal proportional to desired torque. The signal processor provides a control signal for suitable armature voltage control means which controls the armature voltage so as to adjust dynamo torque with respect to the desired torque signal. The signal processor further in response to the dynamo speed signal and in response to a signal proportional to brake pedal position provides a control signal to chopper means for adjusting the power generated by the dynamos in response to the brake pedal position. The signal processor further controls the dynamo field with respect to dynamo torque and speed so as to maximize dynamo operating efficiency. Various related devices and methods are also disclosed.

Abstract: A device employing audio and visual aids for the teaching of reading, arithmetic and the like. The device is to be used with cards having printed indicia and a magnetic strip. The device includes a housing having a microphone, a speaker and a chassis positioned therein. A card path extends across the housing and the chassis. Located on the chassis is a magnetic recording and reproducing head assembly capable of recording and reproducing that which has been recorded on two tracks on the magnetic strip. Separate drive systems are employed for forward and reverse and are also mounted on the chassis. A selector plate is pivotally mounted on the chassis and includes certain rollers associated with both the forward and reverse drive systems such that the selector plate may be pivoted to disengage the forward drive system and simultaneously engage the reverse drive system to return a card to its starting position.