(1) Sealed Cartridge Unit.  MSHA PERMISSIBLE CHEMICAL CARTRIDGE MSHA (Mine Safety and Health Administration).  Cartridge for Organic Vapors, Chlorine, Hydrogen Chloride and Sulfur Dioxide.  Approval NO. -TC-23C-320 Issued to  Pulmosan Safety Corp. Flushing, N.Y. U.S.A. 17168 This sale is for just what is shown in the pictures. Please feel free to ask any questions. Thanks for looking, Margie