Abstract: A respirator mask, including a unitary body member formed of a flexible rubberlike material and having an inner surface to fit and seal upon the face of a user. The body member including at least one opening to receive a filter cartridge and including an internally extending flange portion forming the circumference of the opening. A filter cartridge formed of a substantially rigid material and including an inner grooved portion having a shape substantially complementary to the internally extending flange portion of the body member and with the flange portion for reception within the grooved portion of the cartridge to provide for the cartridge being locked within the opening in the body portion. The internally extending flange portion of the body member and the grooved portion of the cartridge forming a seal to prevent any passage of air from the outside to the inside of the mask, except through the filter cartridge.

Abstract: A track system for toy vehicles formed from a plurality of like interconnectable track sections, each section having a main body portion with upwardly disposed opposing sidewall portions, opposite ends of the sidewall portions and main body portion having sets of projections configured and dimensioned for interlocking engagement with like track sections. Hook members are integrally formed in the main body portion on opposite ends of the longitudinal centerline thereof for interlocking engagement. Each track section is preferably formed in a planar configuration with reduced cross sectional areas defining hinge sections for enabling pivoting of the sidewall portions into transverse relation relative to the main body portion. Regions on opposite sides of the hinge section are configured for interlocking to maintain the positions of the sidewall portions.