Established in October 1986, OSCA-ARCOSA is a leader in the supply of electrical wire assemblies, supplying to the Consumer Electronics, Automotive, Industrial Electronics, Photovoltaic, and Appliance Industries.O&S California, Inc. (OSCA) is the corporate and sales office located in San Diego, California USA. Created from the joint venture between two of the biggest wire manufactures of the world: Onamba Co. Ltd. (Share 70%). and Sumitomo Electric Ind. Ltd. (Share 30%).We are an integrated team of sales, engineering, production, and quality assurance experts, specializing in the assembly of wire harness assemblies. We are dedicated to serving our customers’ requirements at all levels. We work with the customer through the initial stages of design to the completion of the product, until their delivery.