“Registered unloader” means a person who unloads any farm product in a market. It does not, however, include any of the following:
(a) A producer of farm products, or his son or daughter, father or mother, or regularly employed employee of such producer.
(b) The operator of any vehicle which is engaged in the transportation of any farm product to market if the operation of such vehicle is subject to the jurisdiction of the Public Utilities Commission and the rate which is charged for such transportation includes the charge for unloading the farm product which is so transported.
(Added by Stats. 1978, Ch. 585.)