Builder ใดมีวันที่เล็กกว่าปี 1913 และมีความยาวฟุต (m) และตัวเลข 15
Which Builder has a Date smaller than 1913, and a Length of feet (m), and a Number of 15?
df = pd.DataFrame(columns=['builder', 'number', 'date', 'length'])
df[(df['date'] < 1913) & (df['length'] == 'feet (m)') & (df['number'] == '15')]['builder']