A second harmonic generation laser system comprising: a non-linear frequency converting medium; and an external cavity pump laser that produces optical energy at a single mode and at a single frequency and that is disposed to provide the optical energy to the non-linear frequency converting medium. The apparatus comprises a wheeled base frame for traveling over a ground surface provided with bales, the wheeled base frame having opposite front and rear sections, and opposite side sections, the wheeled base frame including a main platform for receiving bales to be loaded thereon. The single-arm pedal assembly can be reconstituted into two separate pedal assemblies. The physical device data includes data defining connection points for connecting the electronic device to external circuits and data identifying a plurality of connection points of the electronic device. There also is provided a process for the preparation of phenylacetic acid compounds 2, wherein R2 and R6 are as defined previously and R5a is hydrogen or alkyl, which are useful for the preparation of pyridazinone compounds.