All such factories, buildings, and other places containing food shall be provided with proper doors and screens necessary and adequate to protect against the contamination of the product from flies, dust, or dirt.
Source: L. 13: p. 511, § 4. L. 21: p. 676, § 2. C.L. § 1018. CSA: C. 69, § 24. CRS 53: § 66-13-4. C.R.S. 1963: § 66-13-4.