Abstract: A polyaxial bone fixation system minimizes the number of parts used to engage a bone bolt in various angular orientations relative to an elongated plate or rods, and also permits for nearly infinite positioning of two or more bone bolts relative to each other along the length of an elongated plate or rods.

Abstract: A low-temperature/cryogenic liquid-storage structure has an inner tank liner made of conventional low-temperature/cryogenic tank-quality plates with structural members that provide flexibility. The plates are mounted on connectors that accommodate movement of the liner with respect to the bearing wall. The plates have a thickness of between 1/16? and ½? and a surface area of at least 100 square feet. The structural members are conventional construction materials that have a wall thickness of more than 1/16?. Load-bearing insulation extends between the outer surface of the inner tank liner and the inner surface of an outer bearing wall that is impervious to vapor.