Example sentences of "[prep] [art] first 20 years " in BNC.

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1 The power available from the hydroelectric station will be at least 800 MW , eight hours a day for the first 20 years , thereafter falling by about 30 per cent .
2 After 1839 the number of staff gradually increased but for the first 20 years the work was confined to southern Britain , limited by the availability of Ordnance Survey maps .
3 The imaginary war , at least for the first 20 years after the war , reproduced the solutions of the second world war .
4 In the deDombal study , all strictures were benign , but in 92% of patients ( 48 of 52 ) they had occurred within the first 20 years of disease ; the lack of malignancy among their strictures was therefore attributable to the fact that most of their patients had disease of short duration .
5 In the first 20 years of the Survey 's activities in Scotland , practically all of the central and southern parts of the country had been surveyed on the 6-inch scale and manuscript copies of the field maps made for public reference .
6 The rate of progress made in the first 20 years was only achieved by the geologists being in the field most of the year .
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