The metropolitan E.P.S. is considering the use of hand-operated sirens to improve the coverage of emergency signals, and a sample has been tested by the organising committee. In the hands of a reasonably strong man, the siren-gives great volume-of -sound;
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Bibliographic details
Press, Volume LXXVIII, Issue 23661, 11 June 1942, Page 3
Word Count
40Page 3 Advertisements Column 1 Press, Volume LXXVIII, Issue 23661, 11 June 1942, Page 3
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