Abstract: A rolling point agricultural spiked wheel injector system for injecting a fluid as a liquid chemical or gas into the ground. The system includes a rotatable injector wheel having a plurality of outwardly directed injector spikes attached to the periphery of the wheel, the spokes being so constructed to easily penetrate the ground for injection of fluid therein. The injector wheel includes a unique rotary valve mechanism of simplistic design selectively operable for permitting fluid to flow when the spike is in the ground penetrating position and blocking the flow of fluid when the spike is out of the ground. The valve sealing system allows free rotation of the wheel with greater sealing pressure over a smaller contact area. The improved valve is a self-cleaning device for movement of abrasive particles in the liquid chemical material around the bearing face of the valve that engages the rotating ribbon surface of the ring with the plurality of openings.

Abstract: A synchronous computing system includes a central processor unit interconnected with external memory units. The processor is integrated monolithically on a single chip and includes a plurality of data registers, a parallel arithmetic logic unit and an instruction register interconnected by a common parallel buss. A control section of the processor synchronizes internal operation of the processor and also system operation, and includes a plurality of programmable logic arrays to provide a versatile method of accommodating different instruction sets, sequences of operation, and instruction cycle duration. The arrays reduce the number of interconnects required and increases utilization of semiconductor material for forming active devices.This is a continuation of application Ser. No. 176,665, filed Aug. 31, 1971, now abandoned.