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sca, inc. has been headquartered in oklahoma city, ok for eleven years. formerly known as shinwa communications of america inc. in the u.s. and as shinwa tsushinki ltd. co. in japan, sca has been producing top quality tone and voice pagers for our fire, police, security, and emergency medical personnel for fifty years. today sca is a global leader in paging technology,supplying a variety of products, including numeric pagers, for consumer, educational, emergency, health care, industrial, public safety, and scientific markets.