Mathematical instruments, namely, measuring rulers, protractors, compasses for measuring, ellipsographs; instruments for measuring length; angle gauges; directional compasses; sextants; azimuth instruments; surveying instruments; cell phones; cell phone cases; cell phone covers; Global Positioning System apparatus; personal digital assistants; covers for personal digital assistants; cases for smartphones; covers for smartphones; computers; computer peripherals; tablet computers; covers for ta...