Table: israel_badminton_champs
Columns: year
men_s_singles
women_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: Who won the men's doubles before 1979 when carol silman prina ben shushan won the women's doubles?
SQL: SELECT "men_s_doubles" FROM israel_badminton_champs WHERE "year" < 1979 AND "women_s_doubles" = 'carol silman prina ben shushan'