List at least 10 device models that male users over the age of 39 usually use.
male refers to gender = 'M'; over the age of 39 refers to group = 'M39+';
SELECT T1.device_model FROM phone_brand_device_model2 AS T1 INNER JOIN gender_age AS T2 ON T1.device_id = T2.device_id WHERE T2.`group` = 'M39+' AND T2.gender = 'M' LIMIT 10