Example sentences of "been [vb pp] [prep] the 1920s " in BNC.

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1 She learnt that it had been developed in the 1920s by a German physician , Dr Max Gerson .
2 Added to this , there are an unknown number of people with various impairments who may have been disabled since the 1920s and have simply been overlooked by researchers , policy-makers and service-providers alike .
3 This , however , is a rule that has not been enforced since the 1920s .
4 He pursued the antimicrobial properties of soil organisms , particularly actinomycetes , which had been known since the 1920s to produce inhibitory substances .
5 The site , near modern Kerma , has been known since the 1920s but the city underneath has only emerged over the last ten years .
6 Silvicultural management has been practised since the 1920s , beginning first with regulation of the telling cycle and then the stimulation of natural regeneration by cutting climbers , removing uneconomic species and canopy thinning in the 1930s , as has been described by Kio and Ekwebelam ( 1987 ) .
7 He says about three years ago Lord Rothschild asked us to restore the rock garden at Waddeson which had been overgrown since the 1920s .
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