CREATE TABLE table_16878 ("Yard Name" TEXT, "Location  ( city ,  state ) " TEXT, "1st Ship Delivery Date" TEXT, "Ship Types Delivered" TEXT, "Total Number of Ways" TEXT, "total vessels built" TEXT)

When was the delevery date when there were 12 ways of delivery?
SELECT "1st Ship Delivery Date" FROM table_16878 WHERE "Total Number of Ways" = '12 ways'
SELECT "1st Ship Delivery Date" FROM "table_16878" WHERE "Total Number of Ways" = '12 ways'