Two-point sight for archery bow
Two-speed continuous tangent screw
Two-speed continuous tangent screw
Ultraviolet risk indicator
Underwater measuring systems and methods
Underwater sight for a spear gun or the like
Unitary space transit
Unitized vehicle measuring gauge and gauging system
Universal angle means
Universal heliodon-sundial
Universal sight tool
Universal solar chart shadow plotter and method for plotting...
Universal sun-clock
Universal sundial
Using viewing-angle-sensitive visual tags to determine...
Utility line angle measurement device
Variable angle aperture card
Variable aperture peep sight for bows
Variable centerline sight
Variable power rifle scope adjuster