Question: What types of ships were made at the Froemming Brothers ship yard?
SQL: SELECT "Ship Types Delivered" FROM "2-11552751-4" WHERE "Yard Name" = 'Froemming Brothers';

Question: What ship types were first delivered in December 1942?
SQL: SELECT "Ship Types Delivered" FROM "2-11552751-4" WHERE "1st Ship Delivery Date" = 'December 1942';