Md. Code, Alcoholic Beverages and Cannabis § 17–403

(a) A Class 7 micro–brewery license may be issued to the holder of:

(1) a Class B beer, wine, and liquor (on–sale) license, for use on the premises of the restaurant for which the Class B license was issued; or

(2) a Class D beer, wine, and liquor license, for use on the premises for which the Class D license was issued.

(b) The hours and days of sale for the Class 7 micro–brewery license are those established for a Class D license.

(c) For the holder of a Class D beer, wine, and liquor license that also holds a Class 7 micro–brewery license, the Board may determine the required ratio of gross receipts from the sale of food to the gross receipts from the sale of alcoholic beverages.