Table schema:
CREATE TABLE table_name_10 (withdrawn INTEGER, rebuilt VARCHAR, gnri_no VARCHAR, name VARCHAR)

Question: What is the smallest withdrawn value with a GNRI greater than 172, name of Croagh Patrick and was rebuilt before 1939?
SQL: SELECT MIN(withdrawn) FROM table_name_10 WHERE gnri_no 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