7 Pa. Code § 146.4
(a) Whenever refrigeration equipment, or milk or cream dispensers, or similar facilities are sold to stores or other wholesale customers, the agreement of sale must be reduced to writing and contain the following:
(d) A dealer or subdealer selling equipment under an agreement providing for payment by means of an additional charge per unit shall maintain the following records for review by the Board for the time period specified in § 147.9 (relating to equipment records):