Abstract: A laser level includes: a covering; a stand on which the covering is mounted; a laser unit provided in a space surrounded by the covering and the stand; and a radiation window, provided in the covering, through which a laser beam emitted from the laser unit is radiated to an exterior of the covering. The laser level includes removal means which removes moisture in the space.

Abstract: A laser level includes: a covering; a stand on which the covering is mounted; a laser unit provided in a space surrounded by the covering and the stand; and a radiation window, provided in the covering, through which a laser beam emitted from the laser unit is radiated to an exterior of the covering. The laser level includes removal means which removes moisture in the space.

Abstract: An automatic fire extinguisher wherein a fire detector receives infrared rays from started fire flame in detecting area at one of many light receiving elements which corresponds to the ray's incident angle into an assembly of infrared-ray passing filter and condenser lens, variations in detected output of the detector resulting from flaring of the fire flames are discriminated, the detected output higher than a predetermined level controllably drives an ejection nozzle to direct it towards the point of the flames and discharges a fire extinguishant out of the nozzle towards the flames, achieving thus a reliable detection and effective extinguishment of only such started fire while preventing any erroneous operation due to other infrared ray sources.

Abstract: An automatic fire extinguisher wherein a fire detector receives infrared rays from started fire flames in detecting area, as unified in the incident amount of the rays, at one of many light receiving elements which corresponds to the ray's incident angle into an assembly of infrared-ray passing filter and condenser lens, variations in detected output of the detector resulting from flaring of the fire flames are discriminated, the detected output higher than a predetermined level controllably drives an ejection nozzle to direct it towards the position of the flames and discharges a fire extinguishant out of the nozzle towards the flames, achieving thus a reliable detection of the fire irrespective of its distance from the detector as well as an effective extinguishment of only such started fire while preventing any erroneous operation due to other infrared ray sources.