custom manufacture of electronic items, namely, circuit assemblies, broadband hardware, cable and fiber optic assemblies, harness assemblies, boards and backplanes, fan assemblies, plastics and castings, power supply harnesses, printed circuit boards and box-level assemblies, enclosures for electronic systems, and metal fabrication and finishing; custom manufacturing of computers for others; Assembly of products for others, namely, custom assembly as contractor or subcontractor of electronic items, namely, circuit assemblies, broadband hardware, cable and fiber optic assemblies, cable and harness assemblies, boards and backplanes, fan assemblies, plastics and castings, power supply harnesses, printed circuit boards and box-level assemblies, enclosures for electronic systems, and metal fabrication and finishing