Abstract: An electronic apparatus for measuring, computing, and displaying linear or angular displacements suited in particular to drafting applications. In display mode, the distance data is entered into the apparatus via a keypad and based on previously entered or predetermined scale or other considerations, electronically iluminated indicator markings of the apparatus indicate the beginning and end of a linear or angular segment representative of the entered data. Alternatively, in measuring mode, the illuminated indicator marking representing an index is placed at one limit of the line or angle to be measured and the other limit is indicated to the apparatus by the user such as by alignment of a slidable member with the other limit of the line or angle to be measured. The apparatus will display by LED or other suitable means, the angle or distance in numerical form represented by the displacement limits presented and based on previously entered or predetermined scale or other considerations.

Abstract: A plenum cover for a vehicle air conditioner of the roof-mounted type. The cover is essentially rectangular in shape having an opening at the top with elongated side walls and a base wall spaced below the top opening and being joined to the elongated side walls by opposed end walls. The base of the cover has a continuous elongated groove located substantially parallel with and spaced between the side walls. The groove in the base extends upwardly toward the top opening in the cover. The groove in the base is adapted to straddle the partition in an armored truck or taxi cab which separates the driver compartment from the cargo or passenger compartment. A plurality of diffusers located in either the base or side walls but on oppposite sides of the grooved portion of the base for diffusing cool air into the compartments located on opposite sides of the vehicle partition.