The license must be posted in a conspicuous place in the room or rooms where the work is carried on. The license may be revoked by the commissioner if the health of the community or of the employees requires it, or if it appears that the place to which the license relates is not in a healthy and proper sanitary condition. Every room in which goods are manufactured, altered, repaired, finished or distributed shall be kept in a clean and sanitary condition, and shall be subject to examination and inspection by the commissioner, factory inspectors, investigators, local boards of health, or tenement house inspectors for the purpose of ascertaining whether the goods, or any part or parts thereof, are clean and free from vermin and every matter of infectious or contagious nature.