Abstract: Imaging devices, systems, and methods are provided for imaging using narrow bands of short wavelength infrared (SWIR) light, e.g., to image at water absorption wavelength and/or to image through blood. In one example, an imaging device is provided for imaging during a medical procedure that includes a proximal end, a distal end sized for introduction into a subject's body, and an imaging element carried by the distal end, a light source coupled to the imaging device to deliver one or both of narrow band short wavelength infrared (SWIR) light and visible light, and a camera for acquiring images via the imaging element.

Abstract: A mine roof support has a roof engaging canopy 23, a floor engaging base 12, and a hydraulic jack 24 acting between the canopy and the base for urging the canopy and the base apart. The hydraulic jack 24 is provided with at least two different locations, movement of the jack means 24 from one location to another location bringing about an alteration in the distance between the canopy and the base. The invention makes it possible to provide a hydraulic jack having a first working position in which the hydraulic jack is arranged in the optimum position to support a mine roof, and a second stowing position for transportation purposes.