As used in this act, the following words and phrases shall have the meanings respectively ascribed to them herein:
(a) "End intake air probes" means any instrument which is used by any person for the collection of grain samples for the testing of grains offered for sale, processing or storage by use of a vacuum;
(b) "person" means any individual, partnership, corporation, cooperative association or association of individuals;
(c) "grains" means wheat, corn, oats, barley, rye, soybeans and grain sorghums.