Abstract: A mechanism, including a memory, sequences operation in a controlled processor. Each operation is stored in memory together with a portion indicating the current state of predecessor operations required to be completed before execution of the current operation. Also associated with the current operation is provision for at least one address of a successor operation. A predecessor portion is updated as the predecessor operations are performed and at a predetermined state, the current operation is sent to the controlled processor for processing. Following the processing, the operations at the successor addresses have their predecessor portions updated. Thus, the order in which the operations are performed is totally independent of an arbitrary sequencing and instead is dependent only upon availability.

Abstract: Tractor, especially farm tractor. A tractor construction is disclosed which is particularly adaptable for manufacture as a plurality of independent units, shipment of same in knock-down form and assembly and maintenance by unskilled labor using only simple tools. The construction comprises a unitary frame member together with independent and separable components including a front end assembly, an engine assembly, a control unit assembly and a rear end assembly. Each of these assemblies are mountable on the frame structure independently of each other and interconnection therebetween is held to a minimum. Maintenance is likewise at a minimum and the above-mentioned assemblies can be replaced if necessary by unskilled labor and with use of only simple tools.