Wireless detector vans being equipped with devices whereby the Post Office could trace defaulters who had installed a wireless set but omitted to buy an annual ten shilling license, 1931. From The Pageant of the Century, published 1934.

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Keywords: 1931, 20th, annual, archival, archive, century, defaulters, detector, devices, equipped, historical, history, illustration, installed, license, office, post, set, shilling, ten, trace, van, vans, wireless