(a) Any milk dealer licensed by the commissioner to distribute milk in the marketing area or purchase or handle or sell milk received by him from producers at a pool plant or bulk tank unit. The term includes all handlers as defined pursuant to section 20.7 of this Title.

(b) Dealer shall not mean a licensed milk dealer who had distribution of class I fluid milk products in the marketing area of no more than 100,000 pounds in the month preceding the effective date of this Part.