Table schema:
CREATE TABLE table_name_90 (year_s__of_manufacture VARCHAR, quantity VARCHAR, type VARCHAR)

Question: Which Year(s) of manufacture has a Quantity larger than 39, and a Type of 1′c1′ h2t?
SQL: SELECT year_s__of_manufacture FROM table_name_90 WHERE quantity > 39 AND type = "1′c1′ h2t"