California Code, Penal Code - PEN § 32700

(a) The business shall be carried on only in the place designated in the license.

(b) The license or a certified copy of the license must be displayed on the premises in a place where it may easily be read.

(c) No machinegun shall be delivered to any person not authorized to receive the machinegun under the provisions of this chapter.

(d) A complete record must be kept of sales made under the authority of the license, showing the name and address of the purchaser, the descriptions and serial numbers of the weapons purchased, the number and date of issue of the purchaser's permit, if any, and the signature of the purchaser or purchasing agent. This record shall be open to the inspection of any peace officer or other person designated by the Attorney General.