Table: emergency_shipbuilding_program_4
Columns: yard_name
location_city_state
1st_ship_delivery_date
ship_types_delivered
total_number_of_ways

Question: What types of ships were made at the Froemming Brothers ship yard?
SQL: SELECT "ship_types_delivered" FROM emergency_shipbuilding_program_4 WHERE "yard_name" = 'froemming brothers'

Question: What ship types were first delivered in December 1942?
SQL: SELECT "ship_types_delivered" FROM emergency_shipbuilding_program_4 WHERE "1st_ship_delivery_date" = 'december 1942'