period of durationの例文

• the furegaki (bakufu orders ) issued in april 1728 said that the duration of the fixed tax rate was 5 years , 7 years , 10 years and 15 years , but the period of duration could be extended by application and the fixed tax rate continued in addition to the prior tax amount (it was called tsuginenki ).
  定免の継続期間は享保13年3月の触書には5箇年、7箇年、10箇年、15箇年があるが、年期が終わると更に申請して年期を切り替え、従前の税額に増して定免を継続することができた（継年期（つぎねんき））。