This work presents a novel and compact method for simultaneously measuring errors in linear displacement and vertical straightness of a moving linear air-bearing stage using 3D sinusoidal-groove linear reflective grating and a novel triangular wave-based sequence signal analysis method. The new scheme is distinct from the previous studies as it considers two signals to analyze linear ... https://www.roneverhart.com/Capsule-Hats-Boston-Red-Sox-Fenway-Park-100-Years-Patch-Metallic-Stitch-Collection-Fitted-Hat/