Katalọgụ-
Ngwọta dị elu maka sistemụ nkwurịta okwu mberede nchekwa ọha
N'ihe gbasara nchekwa ọha, usoro nkwurịta okwu mberede dị mkpa maka ịnọgide na-enwe nkwurịta okwu n'oge ọgba aghara. Sistemụ ndị a na-ejikọta teknụzụ dị iche iche dị ka ikpo okwu mberede, sistemu nkwukọrịta satịlaịtị, igwe mkpirisi na sistemu ultrashortwave, yana nleba anya nleba anya…GỤKWUO
