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Canadian broadcasting developed almost entirely in the private sector in its first decade, from 1922 to 1932. Although there were a few stations owned by public corporations, the vast majority of the broadcasting stations in existence in Canada in 1932 were privately owned for purposes of publicity and /or profit. Unlike other mass media, however, radio broadcasting was quite closely regulated by the state from its earliest days, specifically by the Radio Branch of the federal Department of Marine and Fisheries. This was a consequence of the assumption, dating back to 1905, that wireless communication needed international and national supervision to prevent interference on a limited spectrum and for security reasons. Among other regulations, and unlike the practice in the United States, all Canadian radio owners had to purchase receiving-set licences annually.
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