The Toti class were submarines built for the Italian Navy in the 1960s. They were the first submarines designed and built in Italy since World War II. These boats were small and designed as "hunter killer" anti-submarine submarines. They are comparable to the German Type 205 submarines and the French Aréthuse class submarines.
The subs were built for the Italian Navy, but maybe not by the Italian Navy.
We know they were built for the navy but we do not know if they were built by the navy
( z1 build :ARG1 ( z2 sub ) :ARG3 ( z3 military :name ( z4 name :op "Italian" :op "Navy" ) ) :ARG1-of ( z5 contrast :ARG2 ( z6 possible :ARG1 ( z7 build :polarity - :ARG0 z3 :ARG1 z2 ) ) ) )