Abstract: A hearing system includes at least one earpiece having a shell, an elongate retention element attached to the shell, and an insert unit. The shell has a sound tube portion carrying a soft tip for insertion into the user's ear canal, an outwardly oriented interface portion for detachably receiving the insert unit, and an engagement portion between the sound tube portion and the interface portion for engaging with the tragus/antitragus region of the ear, wherein the material and the dimensions of the retention element are such that the retention element can engage the user's concha by manual deformation by the user, and wherein the insert unit is a filter unit with at least one sound attenuation filter, or is an active electronic unit with at least a loudspeaker, and with an external electronic unit, which is worn on the user's body below the user's neck.

Abstract: A hearing system includes at least one earpiece having a shell, an elongate retention element attached to the shell, and an insert unit. The shell has a sound tube portion carrying a soft tip for insertion into the user's ear canal, an outwardly oriented interface portion for detachably receiving the insert unit, and an engagement portion between the sound tube portion and the interface portion for engaging with the tragus/antitragus region of the ear, wherein the material and the dimensions of the retention element are such that the retention element can engage the user's concha by manual deformation by the user, and wherein the insert unit is a filter unit with at least one sound attenuation filter, or is an active electronic unit with at least a loudspeaker, and with an external electronic unit, which is worn on the user's body below the user's neck.

Abstract: A boiler for making super heated steam by indirect heat exchange of water against a hot gas, said boiler being a vertically oriented vessel comprising a spirally formed conduit around the vertical axis of the vessel, which vessel is provided with an inlet for hot gas fluidly connected to the lower end of the conduit for upwardly passage of hot gas through the spirally formed conduit, an outlet for cooled gas fluidly connected to the upper end of the conduit, an inlet for fresh water and a vessel outlet for super heated steam, said vessel further provided with a water bath space in the lower end of the vessel and a saturated steam collection space above said water bath space, said spirally formed conduit comprising of a spirally formed evaporating section located in the water bath space and a spirally formed super heater section at the upper end of the vessel, wherein the conduit of the super heater section is surrounded by a second conduit forming an annular space between said super heater conduit and said se

Abstract: A boiler for making super heated steam by indirect heat exchange of water against a hot gas, said boiler being a vertically oriented vessel comprising a spirally formed conduit around the vertical axis of the vessel, which vessel is provided with an inlet for hot gas fluidly connected to the lower end of the conduit for upwardly passage of hot gas through the spirally formed conduit, an outlet for cooled gas fluidly connected to the upper end of the conduit, an inlet for fresh water and a vessel outlet for super heated steam, said vessel further provided with a water bath space in the lower end of the vessel and a saturated steam collection space above said water bath space, said spirally formed conduit comprising of a spirally formed evaporating section located in the water bath space and a spirally formed super heater section at the upper end of the vessel, wherein the conduit of the super heater section is surrounded by a second conduit forming an annular space between said super heater conduit and said se