MINNEAPOLIS, March 12 -- APA Optics said it has signed a purchase agreement to acquire certain assets of Computer System Products Inc., a private company that makes standard and custom fiber optic and copper cable assemblies, value-added fiber optic frames, panels and modules for the data communication and telecommunication industries. APA Optics makes advanced products for the fiber optic communications, optoelectronics and laser industries, including dense wavelength division multiplexers, ultraviolet detectors, nitride epitaxial layers and custom optics. 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