CREATE TABLE table_name_10 (withdrawn INTEGER, rebuilt VARCHAR(255), gnri_no VARCHAR(255), name VARCHAR(255))
What is the smallest withdrawn value with a GNRI greater than 172, name of Croagh Patrick and was rebuilt before 1939?
    
SQL: SELECT MIN(withdrawn) FROM table_name_10 WHERE gnri_no > 172 AND name = "croagh patrick" AND rebuilt < 1939