1931 Ill.Laws 453, An Act to Regulate the Sale, Possession and Transportation of Machine Guns, § 4.

Every manufacturer or merchant shall keep a register of all machine guns manufactured or handled by him. This register shall show the date of the sale, loan, gift, delivery or receipt of any machine gun, the name, address and occupation of the person to whom the machine gun was sold, loaned, given or delivered, or from whom it was received, and the purpose for which the person to whom the machine gun was sold, loaned, given or delivered, purchased or obtained said machine gun. Upon demand, every manufacturer or merchant shall permit any sheriff or deputy sheriff, or any police officer to inspect his entire stock of machine guns, parts and supplies therefor, and shall produce the register herein required and all written permits to purchase or possess a machine gun, which he has retained and filed in his place of business for inspection by such officer.