Abstract: A device to removably hold a solid fuel heating module includes a body member defining an open ended chamber and generally U-shaped channels in each of an opposing pair of side walls. The elongated channels are sized and configured to slidably receive a respective side edge of the heating module when the heat module is inserted in a rectilinear direction between the opposing side walls. A space is defined in a top wall in communication with the chamber so as to be in registry with the heating module and guard members bridge the space to prevent the user's foot from directly contacting the heating module contained in the chamber. A chimney defined in the body permits cool air to flow from a direction from the rear wall towards the chamber, be heated by the heat module and then transferred to the user's foot by virtue of the space defined in the top wall.

Abstract: A device for alerting miners of an unsafe condition existing in mine shafts includes a surface-engaging member, a chamber-defining member having a compressible medium therein, and a plunger connected between the surface-engaging member and chamber-defining member. The plunger is slidably engaged with the chamber at one end in contact with the compressible medium therein so that the plunger moves in response to a compression force applied to the surface engaging member and applies pressure on the compressible medium. A switch for actuating an alarm in response to a predetermined amount of movement between the surface-engaging member and the chamber-defining member, is provided and a visual indicator operatively associated with the compressible medium is utilized so as to set the switch to establish the predetermined amount of movement necessary to actuate the alarm.