Abstract: An educational dinnerware device has an interior surface connected to a rim. The interior surface has at least one interior side wall and a bottom surface defining a food area. An exterior surface of the educational dinnerware device is connected to and extends away from the rim and has at least one exterior side wall and an exterior bottom surface. Formed in the exterior bottom surface is a card loading cavity with an exterior viewing surface forming a wall of the card loading cavity. A viewing card having two opposite viewing surfaces and an edge is placed in the card viewing cavity and allows one of the surfaces of the viewing card to be viewed through the exterior viewing surface, which can be viewed through the interior viewing surface of the educational dinnerware device.

Abstract: A rock dusting composition composed of rock dust, e.g., limestone or other mineral dust, water, pumping aid, and polymer, e.g., acrylamide homopolymers, acrylamide copolymers, and combinations thereof, and a method for applying the composition to the surface of a mine. The composition has a water content and a polymer content sufficient to allow the polymer to (i) disperse water molecules within the composition and, upon drying of the composition, (ii) dissipate forming void spaces in the dried composition. The composition is useful for suppressing propagation of a flame and/or fire caused by ignition of coal dust and/or gas within a coal mine.

Abstract: An educational dinnerware device has an interior surface connected to a rim. The interior surface has at least one interior side wall and a bottom surface defining a food area. An exterior surface of the educational dinnerware device is connected to and extends away from the rim and has at least one exterior side wall and an exterior bottom surface. Formed in the exterior bottom surface is a card loading cavity with an exterior viewing surface forming a wall of the card loading cavity. A viewing card having two opposite viewing surfaces and an edge is placed in the card viewing cavity and allows one of the surfaces of the viewing card to be viewed through the exterior viewing surface, which can be viewed through the interior viewing surface of the educational dinnerware device.

Abstract: A rock dusting apparatus comprising: a housing; a tank mounted within the housing which comprises a removable top wall member, a sidewall member and a bottom wall member configured to form an internal tank compartment for holding and mixing a rock dust composition; a mixer positioned on the bottom wall member for mixing the rock dust composition; a tank discharge port positioned on the bottom wall member or a lower portion of the sidewall member through which the rock dust composition can be discharged from the tank; a conduit extending from the tank discharge port to a housing discharge port; the conduit comprising a pump for transporting the rock dust composition through the conduit and through a discharge line operatively connected to the housing discharge port; and one or more motors mounted within the housing for powering the mixer and the pump.

Abstract: A rock dusting apparatus comprising: a housing; a tank mounted within the housing which comprises a removable top wall member, a sidewall member and a bottom wall member configured to form an internal tank compartment for holding and mixing a rock dust composition; a mixer positioned on the bottom wall member for mixing the rock dust composition; a tank discharge port positioned on the bottom wall member or a lower portion of the sidewall member through which the rock dust composition can be discharged from the tank; a conduit extending from the tank discharge port to a housing discharge port; the conduit comprising a pump for transporting the rock dust composition through the conduit and through a discharge line operatively connected to the housing discharge port; and one or more motors mounted within the housing for powering the mixer and the pump.

Abstract: A rock dusting composition composed of rock dust, e.g., limestone or other mineral dust, water, pumping aid, and polymer, e.g., acrylamide homopolymers, acrylamide copolymers, and combinations thereof, and a method for applying the composition to the surface of a mine. The composition has a water content and a polymer content sufficient to allow the polymer to (i) disperse water molecules within the composition and, upon drying of the composition, (ii) dissipate forming void spaces in the dried composition. The composition is useful for suppressing propagation of a flame and/or fire caused by ignition of coal dust and/or gas within a coal mine.